ORCID Profile
0000-0002-9340-7461
Current Organisations
University of New South Wales - Randwick Campus
,
University of New South Wales
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Oceanography | Marine and Estuarine Ecology (incl. Marine Ichthyology) | Ecology | Biological Oceanography | Biological Oceanography | Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Ecological Applications | Ecological Impacts of Climate Change | Environmental Science and Management | Ecosystem Studies And Stock Assessment | Evaluation Of Management Strategies | Physical Oceanography | Environmental Management And Rehabilitation | Freshwater Ecology | Fisheries Management | Fisheries Sciences | Ecosystem Function | Landscape Ecology | Oceanography Not Elsewhere Classified | Geology | Atmospheric Sciences | Microbiology | Natural Resource Management | Chemical Oceanography | Marine Geoscience | Groundwater Hydrology | Information Systems Management | Aquatic Ecosystem Studies and Stock Assessment | Terrestrial Ecology | Natural Resource Management | Microbial genetics | Geology Not Elsewhere Classified | Conservation And Biodiversity | Behavioural Ecology | Palaeoclimatology | Wildlife and Habitat Management | Global Change Biology | Fisheries Sciences not elsewhere classified | Geology | Microbial Genetics | Microbial Ecology | Marine geoscience | Molecular Evolution | Earth system sciences | Atmospheric Sciences Not Elsewhere Classified
ANZSRC Socio-Economic Objective (SEO)
Estuarine and lagoon areas | Fisheries—recreational | Fisheries—commercial | Oceanic processes (excl. climate related) | Marine Flora, Fauna and Biodiversity | Ecosystem Assessment and Management of Marine Environments | Marine Oceanic Processes (excl. climate related) | Integrated (ecosystem) assessment and management | Rehabilitation of degraded coastal and estuarine areas | Climate change | Land and water management | Integrated (ecosystem) assessment and management | Aquaculture | Ecosystem Adaptation to Climate Change | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Forestry | Biological sciences | Earth sciences | Physical sciences | Land and water management | Global climate change adaptation measures | Rights to Environmental and Natural Resources (excl. Water Allocation) | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Climate Change Adaptation Measures | Wild Caught Fin Fish (excl. Tuna) | Fisheries - Recreational | Land and water management | Marine protected areas | Living resources (flora and fauna) | Living resources (flora and fauna) | Land and water management | Physical and chemical conditions | Global Effects of Climate Change and Variability (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. Social Impacts) | Expanding Knowledge in the Earth Sciences | Coastal and Estuarine Water Management |
Related Links
Publications
Carbon and nitrogen stable isotope analysis of three types of oyster tissue in an impacted estuary
Publisher: Elsevier BV
Date: 2006
The Mortality/Growth ratio of larval fish and the slope of the zooplankton size‐spectrum
Publisher: Wiley
Date: 07-12-2021
DOI: 10.1111/FAF.12633
Abstract: Predicting recruitment remains a fundamental problem in fisheries science. The Mortality/Growth ratio ( M / G ) of larval fish summarizes the competing rates of M and G in relation to cohort survival and potential recruitment. The larval cohort biomass initially declines after spawning ( M G ) until transition ( M / G = 1), after which the cohort may grow in biomass ( M G ). A major challenge is to obtain routine fine‐scale measurements of M / G and integrate them over broad scales. Here, we propose the M / G size‐spectrum hypothesis, whereby the M / G ratio of larval fish is correlated with the slope ( S ) of the zooplankton size‐frequency distribution. S represents the tension between faster and more efficient growth (flatter S ) and mortality (steeper S ) among particles the size of larval fish. S is explicitly driven by the ratio of mortality to growth of zooplankton, and the range of published values of S (−0.4 to −2) is consistent with M / G ratios reported for larval fish. As S can be measured at fine and large spatial scales using towed optical plankton counters, the M / G size‐spectrum hypothesis provides a context to help quantify the recruitment potential of larval fish.
Latitudinal, ontogenetic, and historical shifts in the diet of a carnivorous teleost, Arripis trutta, in a coastal pelagic ecosystem altered by climate change
Publisher: Canadian Science Publishing
Date: 08-2013
Abstract: Changes to the global climate are driving alterations to boundary current-influenced marine ecosystems. The diet of a pelagic teleost, Arripis trutta, was examined in the East Australian Current (EAC)-dominated coastal waters of southeastern (SE) Australia. The diet of A. trutta was dominated by pelagic baitfish, primarily Australian sardine (Sardinops sagax) and scads (Trachurus spp.). Diet varied substantially with both latitude and season linked to variability in the distribution and abundance of key prey species. An ontogenetic diet shift occurred, with crustaceans and polychaetes making up a large proportion of the diet of small fish compared with the dominance of baitfish at larger sizes. The diet of A. trutta has undergone a dramatic shift from one dominated by krill (Nyctiphanes australis) historically to baitfish today. This change is consistent with a well-documented regime shift caused by the increasing intensity of the EAC on coastal SE Australian waters. Understanding the temporal dynamics of this ecosystem is crucial for management of coastal fisheries and also for understanding the impacts of climate change on boundary current-dominated marine ecosystems worldwide.
Tidal currents, sampling effort and baited remote underwater video (BRUV) surveys: Are we drawing the right conclusions?
Publisher: Elsevier BV
Date: 02-2013
Entrainment and retention of the coastal larval fish assemblage by a short‐lived, submesoscale, frontal eddy of the East Australian Current
Publisher: Wiley
Date: 28-07-2013
Three-dimensional structure of a swarm of the salp Thalia democratica within a cold-core eddy off southeast Australia
Publisher: American Geophysical Union (AGU)
Date: 31-12-2011
DOI: 10.1029/2011JC007310
A designed artificial reef is among the most productive marine fish habitats: new metrics to address ‘production versus attraction’
Publisher: Springer Science and Business Media LLC
Date: 19-08-2016
Modelling the distribution of fish around an artificial reef
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/MF16019
Abstract: Artificial reefs are a widely used tool aimed at fishery enhancement, and measuring the scale at which fish assemblages associate with these artificial habitat patches can aid reef design and spatial arrangement. The present study used rapidly deployed underwater video (drop cameras) to determine the magnitude and spatial scale of associations between a fish assemblage and a coastal artificial reef. Count data from drop cameras were combined with distance and bathymetry information to create a suite of explanatory generalised linear mixed models (GLMMs). The GLMMs showed that artificial reefs can influence surrounding fish abundance, but that the magnitude and scale is species specific. Three of the eight taxonomic groups examined showed a positive association with the artificial reef (with model fit poor for the remaining groups) and depth and bottom cover were also influential variables. The spatial scales of these associations with the artificial reef were small, and it was generally the presence of reef (i.e. a reef bottom type) that explained more variation in fish abundance than did distance to reef. The schooling baitfish yellowtail scad was an exception, and had elevated abundance m from the artificial reef. Further distribution modelling of artificial reefs will benefit species-specific design and management of artificial reefs.
Thermal limitation of performance and biogeography in a free-ranging ectotherm: insights from accelerometry
Publisher: The Company of Biologists
Date: 2014
DOI: 10.1242/JEB.104455
Abstract: Theoretical and laboratory studies generally show ectotherm performance increases with temperature to an optimum, and subsequently declines. Several physiological mechanisms likely shape thermal performance curves, but responses of free-ranging animals to temperature variation will represent a compromise between these mechanisms and ecological constraints. Thermal performance data from wild animals balancing physiology and ecology is rare, and this represents a hindrance for predicting population impacts of future temperature change. We used internally-implanted accelerometers near the middle of a species' geographical distribution and gill-net catch data near the species' latitudinal extremes to quantify temperature-related activity levels of a wild predatory fish (Platycephalus fuscus). We examined our data in the context of established models of thermal performance, and the relationship between thermal performance thresholds and biogeography. Acceleration data approximated a thermal performance curve, with activity peaking at 23°C, but declining rapidly at higher temperatures. Gill-net catch data displayed a similar trend, with a temperature-associated increase and decrease in catch rates in temperate and tropical regions, respectively. Extrapolated estimates of zero activity (CTmin and CTmax) from the accelerometers were similar to the minimum and maximum mean monthly water temperatures experienced at the southern and northern (respectively) limits of the species distribution, consistent with performance-limited biogeography in this species. These data highlight the fundamental influence of temperature on ectotherm performance, and how thermal performance limits may shape biogeography. Biologging approaches are rarely used to examine thermal performance curves in free-ranging animals, but these may be central to understanding the trade-offs between physiology and ecology that constrain species' biogeographies and determine the susceptibility of ectotherms to future increases in temperature.
Impacts on fish transported in tube fishways
Publisher: Elsevier BV
Date: 05-2022
An automated image analysis system for estimating fecundity in portunid crabs
Publisher: Elsevier BV
Date: 2022
The strengthening East Australian Current, its eddies and biological effects - an introduction and overview
Publisher: Elsevier BV
Date: 03-2011
A deep dive into the ecology of Gamay (Botany Bay, Australia): Current knowledge and future priorities for this highly modified coastal waterway
Publisher: CSIRO Publishing
Date: 19-07-2023
DOI: 10.1071/MF22268
Abstract: Context Gamay is a coastal waterway of immense social, cultural and ecological value. Since European settlement, it has become a hub for industrialisation and human modification. There is growing desire for ecosystem-level management of urban waterways, but such efforts are often challenged by a lack of integrated knowledge. Aim and methods We systematically reviewed published literature and traditional ecological knowledge (TEK), and consulted scientists to produce a review of Gamay that synthesises published knowledge of Gamay’s aquatic ecosystem to identify knowledge gaps and future research opportunities. Key results We found 577 published resources on Gamay, of which over 70% focused on ecology. Intertidal rocky shores were the most studied habitat, focusing on invertebrate communities. Few studies considered multiple habitats or taxa. Studies investigating cumulative human impacts, long-term trends and habitat connectivity are lacking, and the broader ecological role of artificial substrate as habitat in Gamay is poorly understood. TEK of Gamay remains a significant knowledge gap. Habitat restoration has shown promising results and could provide opportunities to improve affected habitats in the future. Conclusion and implications This review highlights the extensive amount of knowledge that exists for Gamay, but also identifies key gaps that need to be filled for effective management.
Predator driven diel variation in abundance and behaviour of fish in deep and shallow habitats of an estuary
Publisher: Elsevier BV
Date: 05-2014
Self-organisation of zooplankton communities produces similar food chain lengths throughout the ocean
Publisher: Research Square Platform LLC
Date: 25-04-2022
DOI: 10.21203/RS.3.RS-1186379/V1
Abstract: For over 50 years, the conceptualisation of low-nutrient oligotrophic systems having longer food chains and thus lower energy transfer to fish than their high-nutrient eutrophic counterparts 1 has achieved the status of an ecological paradigm. However, recent global assessments indicate global fish biomass could be much higher than previously thought 2–4 , suggesting that our traditional understanding of food webs may need to be revisited. Here, we challenge the classical paradigm by exploring the role of zooplankton in food webs across the world’s oceans. Using observed zooplankton size spectra, and output from a size-spectrum model that resolves nine zooplankton groups, we conclude that food chains in oligotrophic (low-nutrient) and eutrophic (high-nutrient) systems have similar lengths. We offer a compelling hypothesis to explain this emergent pattern: self-organisation of zooplankton groups across the global productivity gradient regulates food chain length. We find that in oligotrophic systems the increased carnivory and longer food chains are offset by relatively large gelatinous filter feeders eating the dominant small phytoplankton, resulting in shorter-than-expected food chains, but decreasing food quality for fish. Our findings highlight the pivotal role zooplankton play in regulating energy transfer. Better resolution of zooplankton groups, their feeding relationships and carbon content in models will increase our ability to estimate current global fish biomass 5 , project future fish biomass under climate change 6–8 , and provide more-robust forecasts of nutrient 9 and carbon cycling 10 .
Estimating the stocking potential of fish in impoundments by modelling supply and steady-state demand
Publisher: Wiley
Date: 16-05-2012
Batch marking of otoliths and fin spines to assess the stock enhancement of Argyrosomus japonicus
Publisher: Wiley
Date: 31-03-2005
Distribution and movement of a stocked freshwater fish: implications of a variable habitat volume for stocking programs
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/MF11120
Abstract: Fish are commonly stocked into impoundments globally, yet their patterns of habitat use in this variable environment are rarely incorporated into the management of stocking density. The movement and distribution of Australian bass Macquaria novemaculata (Perchichthyidae) were monitored in two impoundments to assess whether: (1) impoundment populations exhibit behaviour typical of wild or riverine percichthyids (2) changing gradients of temperature and dissolved oxygen influenced distribution and (3) the volume of available habitat should be incorporated into the management of these fisheries. Habitat use was determined with a combination of gill netting and ultrasonic telemetry using depth-coded tags. Tagged fish displayed both crepuscular and migratory behaviour typical of the Percichthyidae, but also showed a previously unobserved ision between littoral and pelagic foraging strategies. Australian bass showed no obvious thermal preferences, but avoided areas with dissolved oxygen mg L–1. In one impoundment, a combination of hypoxia and water extraction reduced the volume of available habitat to 15% of maximum in March 2009, which coincided with increased catch per unit effort (CPUE) and decreased fish condition. The adaptive behaviour of Australian bass makes them well suited to the variability of impoundments, but annual and stochastic events of habitat reduction should be considered when planning stocking regimes for these fisheries.
Effects of sewage effluent discharge on the abundance, condition and mortality of hulafish, Trachinops taeniatus (Plesiopidae)
Publisher: Elsevier BV
Date: 07-1999
DOI: 10.1016/S0269-7491(99)00054-8
Abstract: The effects of sewage effluent on the abundance, condition (length and reproduction) and mortality of hulafish Trachinops taeniatus were investigated at multiple outfall and control locations on the central coast of New South Wales, Australia. Underwater visual surveys found consistently fewer T. taeniatus at locations where sewage was discharged compared to control locations. The condition of T. taeniatus was investigated by comparing mean length and reproductive indices of fish from two outfall and two control locations. Fish from the largest outfall location were significantly smaller in comparison with fish from control locations. Gravid female fish from outfall locations had similar gonadosomatic indices but a significantly greater number of eggs and smaller size of eggs in comparison with fish from control locations. Mortality of T. taeniatus was investigated during 2-week, in situ, caging experiments at multiple locations and times and 80% of fish survived, although mortalities of up to 73% per cage were recorded at one sewage outfall. T. taeniatus may be a suitable environmental indicator species of sewage pollution.
Significance of larval condition: comment on laboratory experiments
Publisher: Canadian Science Publishing
Date: 07-2000
DOI: 10.1139/F00-098
Can the nitrogen and carbon stable isotopes of the pygmy mussel, Xenostrobus securis, indicate catchment disturbance for estuaries in northern New South Wales, Australia?
Publisher: Springer Science and Business Media LLC
Date: 10-2005
DOI: 10.1007/BF02732910
Exposure to sewage plumes and the incidence of deformities in larval fishes
Publisher: Elsevier BV
Date: 1996
Zooplankton trophic niches respond to different water types of the western Tasman Sea: A stable isotope analysis
Publisher: Elsevier BV
Date: 10-2015
Pelagic forage fish distribution in a dynamic shelf ecosystem – Thermal demands and zooplankton prey distribution
Publisher: Elsevier BV
Date: 02-2020
Mesoscale oceanographic features drive divergent patterns in connectivity for co‐occurring estuarine portunid crabs
Publisher: Wiley
Date: 07-09-2022
DOI: 10.1111/FOG.12608
Abstract: Larval dispersal and connectivity have important implications for fisheries management, especially for species with life cycles influenced by ocean boundary currents. Giant Mud Crab ( Scylla serrata ) and Blue Swimmer Crab ( Portunus armatus ) are two estuarine portunid crabs (Family: Portunidae) that support significant commercial and recreational harvest in eastern Australia. Giant Mud Crab migrate to coastal waters to spawn, and while Blue Swimmer Crab spawn primarily within estuaries they occasionally migrate to coastal waters to spawn, followed by larval dispersal in the East Australian Current (EAC). Here, we coupled a high‐resolution oceanographic model with a Lagrangian particle tracking framework to simulate larval dispersal and determine the extent of population connectivity in this region. Our simulations indicate broad‐scale connectivity (~40–400 km), characterised by high inter‐estuary connectivity. Overall, our results suggest a north‐to‐south source‐sink structure for both species, with contributions of particles from the north ranging from 51% to 99%. Recruitment to a given estuary is dependent on the proximity of mesoscale oceanographic features of the EAC. Most notably, the EAC separation acts as a barrier to recruitment between spawning and settlement to the north/south of this region. This significantly limits interjurisdictional connectivity for these species, especially Blue Swimmer Crab, likely due to a shorter pelagic larval duration than Giant Mud Crab. Our results provide evidence to inform the assessment and management of these species.
Otolith research and application: current directions in innovation and implementation
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF05111
Abstract: The Third International Symposium on Fish Otolith Research and Application was held in Townsville, Queensland, Australia from 11 to 16 July 2004. The overall theme was ‘Innovation and Implementation’, a collection of which is published here (Volume 56, Issue 5). Although age and growth studies predominated at the Symposium, new areas of quality-control assurance, annual-increment formation in deep-sea and tropical fish, image analysis and two-dimensional feature extraction were demonstrated. New statistical approaches were also evident, particularly in the subs ling of commercial data for estimating age compositions. The chemical composition of otoliths as natural data loggers has greatly advanced since the 1998 Symposium, with the advent of micromilling machines, new instrumentation and the use of isotopes rather than elements as environmental indicators. Otoliths will continue to support modern environmental needs for fisheries, marine park assessment, metapopulation conservation and the management of stocks and bio ersity of fish.
Multispecies presence and connectivity around a designed artificial reef
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/MF16127
Abstract: A goal of designed artificial reefs (ARs) is to enhance fish abundance, species ersity and fishing opportunities by providing food and refuge for fish. Quantifying the contribution of ARs to coastal ecosystems and fisheries productivity requires an understanding of fish presence at the structure and connectivity with surrounding habitats. In the present study, the movements and presence of 10 eastern fiddler rays (Trygonorrhina fasciata), 17 Port Jackson sharks (Heterodontus portusjacksoni) and 18 bluespotted flathead (Platycephalus caeruleopunctatus) were monitored using acoustic telemetry around a designed AR in 38-m depth near Sydney, Australia. Fiddler rays exhibited an average short-term presence of 43% at the AR, and 26% over the ~20-month monitoring period, which was significantly higher than the other two species. Fish tagged at the AR showed high affinity to the site at which they were tagged compared with fish tagged on natural reef. All three species moved frequently between the AR and the other reefs in the area, indicating that the AR may increase the connectivity between adjacent habitats and aid the dispersion of benthic species. The moderate presence at the AR suggests that these species may contribute to some biomass production at this AR by incorporating this reef in their natural range.
Predation domes: In‐situ field assays to measure predatory behaviours by fish
Publisher: Wiley
Date: 22-06-2023
Abstract: Biotic interactions such as predation are difficult ecological processes to quantify in the wild. This is especially the case in the marine environment due to logistical difficulties in capturing animal behaviour. Common approaches use aquarium‐based experiments, live‐tethering, or assays with bait as proxies for quantifying predation pressure. However, these methods often fail to account for natural interactions between species in the wild and may raise ethical and animal welfare concerns. We designed a novel field‐based method to quantify predator–prey interactions for marine fishes. The “predation dome” is a clear acrylic aquarium that contains a live fish. The dome is filmed and, in contrast to other methods, it allows for natural olfactory and visual cues, and the prey fish is returned to the wild after the assay. Here, we provide a step‐by‐step guide on building and deploying the predation dome in the wild. To demonstrate its use, we quantified predation pressure using the domes in two tropical and two temperate locations. Piscivores were attracted to the domes and displayed predatory behaviours such as circling or striking. Although the overall number of predatory attacks did not differ among locations, predation domes revealed higher predation pressure by piscivores at the tropical locations in comparison to temperate reefs. Our results show that predation domes represent an ethical and complementary approach to measure predation that may better represent piscivory as compared to other behaviours. Predation domes can be also used to measure other biotic interactions such as territorial defence or courtship.
Fish Assemblages on Estuarine Artificial Reefs: Natural Rocky-Reef Mimics or Discrete Assemblages?
Publisher: Public Library of Science (PLoS)
Date: 03-06-2013
Eddy‐Driven Cross‐Shelf Transport in the East Australian Current Separation Zone
Publisher: American Geophysical Union (AGU)
Date: 02-2020
DOI: 10.1029/2019JC015613
Abstract: In western boundary current systems, sharp velocity gradients between the poleward flowing jet and coastal waters generally act to inhibit cross‐shelf exchange. Downstream of jet separation, dynamic mesoscale eddies dominate the flow. In the East Australian Current System, counter‐rotating eddy dipoles are often present which, in the appropriate configuration, have potential to drive cross‐shelf transport. However, this eddy dipole mode is poorly understood in the framework of cross‐shelf exchange and the effect of these structures on shelf waters is uncertain. Using 25 years of satellite altimetry, as well as in situ s ling of a typical dipole event, we investigate the characteristics of eddy‐driven cross‐shelf exchange. We show that the maximum onshore velocity is driven by an eddy dipole structure and occurs in a defined latitudinal band between 33°S and 34°S more than 50% of the time. We s le a typical eddy dipole and find a strong onshore jet, 37 km wide, with velocities up to 1.78 m s and a transport of at least 16 Sv. Hydrographic data from an autonomous underwater glider show that this jet manifests on the shelf as a subsurface intrusion of warm salty water extending from offshore up onto the midshelf. In the light of climatic changes in western boundary current transport and the increase in their eddy kinetic energy, understanding eddy‐driven cross‐shelf exchange is important to predict future changes to the shelf water mass.
Identifying critical estuarine seagrass habitat for settlement of coastally spawned fish
Publisher: Inter-Research Science Center
Date: 03-06-2010
DOI: 10.3354/MEPS08582
The influence of an offshore artificial reef on the abundance of fish in the surrounding pelagic environment
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/MF14064
Abstract: Artificial reefs are a popular fisheries management tool, but the effect of these reefs on the abundance of fish in the surrounding pelagic environment is uncertain. Pelagic baited remote underwater video (PBRUV) was used to observe the fish assemblage surrounding an offshore artificial reef (OAR), near Sydney, Australia. PBRUVs were deployed at three distances (30, 100, 500m) from the OAR, and compared with a drop camera deployed directly over the OAR. There was a significantly greater abundance of fish on the OAR, but no significant difference in abundance at the 30-, 100- or 500-m distances. Two highly mobile non-resident species (Seriola lalandi, Pseudocaranx dentex) were significantly more abundant on the OAR, but this association was not detected 30m away. The lack of a significant difference in total fish abundance, or in assemblage composition, between the 30-, 100- and 500-m distances suggests that any association with the OAR is on a localised scale ( m). One exception was the ocean leatherjacket (Nelusetta ayraudi), which had an association detected 100m from the OAR. This predominantly small-scale effect may be influenced by the proximity of this OAR to numerous natural reefs.
Home range, activity and distribution patterns of a temperate rocky-reef fish, Cheilodactylus fuscus
Publisher: Springer Science and Business Media LLC
Date: 09-12-1998
Spatial variation in δ13C and δ15N of liver, muscle and bone in a rocky reef planktivorous fish: the relative contribution of sewage
Publisher: Elsevier BV
Date: 06-2004
Complexity affects habitat preference and predation mortality in postlarval Penaeus plebejus: implications for stock enhancement
Publisher: Inter-Research Science Center
Date: 07-04-2009
DOI: 10.3354/MEPS07936
Seasonal forecasting of dolphinfish distribution in eastern Australia to aid recreational fishers and managers
Publisher: Elsevier BV
Date: 06-2017
Relative effects of physical and biological processes on nutrient and phytoplankton dynamics in a shallow estuary after a storm event
Publisher: Springer Science and Business Media LLC
Date: 02-2006
DOI: 10.1007/BF02784701
Regulated recruitment: native and alien fish responses to widespread floodplain inundation in the Macquarie Marshes, arid Australia
Publisher: Wiley
Date: 30-04-2014
DOI: 10.1002/ECO.1496
The effect of targeted stocking on behaviour and space utilization of a released finfish
Publisher: Oxford University Press (OUP)
Date: 09-01-2014
Abstract: Targeted stocking involves the release of fish directly into high-quality habitat, however this is often time-consuming, expensive and difficult. Acoustically tagged hatchery-reared juvenile mulloway Argyrosomus japonicus were released in groups directly into deep-hole habitat preferred by wild conspecifics (targeted stocking), or in a non-targeted fashion near easily accessible sites that lacked high-quality habitats in the direct vicinity. Fish were tracked continuously, 24 h d−1, for 5 d following release. Fish released in a targeted fashion showed lower mean activity rates (50% less movement) and occupied higher quality habitats than fish released in a non-targeted fashion. Fish released in a non-targeted fashion also used a greater number of smaller habitat patches. The implications for improvements in behaviour and habitat usage patterns for fish released in a targeted fashion, such as improved growth and survival, are discussed. Identifying and releasing fish directly into the species' high-quality habitat may ultimately improve the success of stocking programs.
Distribution of Palinuridae and Scyllaridae phyllosoma larvae within the East Australian Current: a climate change hot spot
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18331
Abstract: Many marine species are predicted to shift their ranges poleward due to rising ocean temperatures driven by climate change. For benthic marine species with pelagic larval stages, poleward range shifts are often facilitated through pelagic larval transport via western boundary currents (WBC). By surveying pelagic larval distributions within WBCs, species advected poleward of their known distributions can be identified and monitored. Palinurid and scyllarid lobster larvae (phyllosoma) have long pelagic larval durations, providing high potential for poleward advection. We surveyed spatial distribution of phyllosoma within the western-boundary East Australian Current. Due to difficulties morphologically identifying phyllosoma, we tested the utility of molecular identification using cytochrome c oxidase I (COI). From COI sequences of 56 phyllosoma and one postlarva, 65% of sequences consisted of good-quality mitochondrial DNA. Across water types s led, scyllarid phyllosoma exhibited relatively homogeneous distribution, whereas palinurid phyllosoma exhibited heterogeneous distribution with greatest abundance inside a warm core eddy on the south coast of eastern Australia. Two tropical and one subtropical palinurid species were detected ~75–1800km to the south or south-west of their known species distribution. Our results indicate tropical lobster species are reaching temperate regions, providing these species the opportunity to establish in temperate regions if or when environmental conditions become amenable to settlement.
Feeding in a larval fish assemblage: The nutritional significance of an estuarine plume front
Publisher: Springer Science and Business Media LLC
Date: 04-1996
DOI: 10.1007/BF00346303
The influence of tidal phase on patterns of ichthyoplankton abundance in the vicinity of an estuarine front, Botany Bay, Australia
Publisher: Elsevier BV
Date: 07-1996
Mean hydrography on the continental shelf from 26 repeat glider deployments along Southeastern Australia
Publisher: Springer Science and Business Media LLC
Date: 30-08-2016
Abstract: Since 2008, 26 glider missions have been undertaken along the continental shelf of southeastern Australia. Typically these missions have spanned the continental shelf on the inshore edge of the East Australian Current from 29.5–33.5 ° S. This comprehensive dataset of over 33,600 CTD profiles from the surface to within 10 m of the bottom in water depths ranging 25–200 m provides new and unprecedented high resolution observations of the properties of the continental shelf waters adjacent to a western boundary current, straddling the region where it separates from the coast. The region is both physically and biologically significant, and is also in a hotspot of ocean warming. We present gridded mean fields for temperature, salinity and density, but also dissolved oxygen and chlorophyll-a fluorescence indicative of phytoplankton biomass. This data will be invaluable for understanding shelf stratification, circulation, biophysical and bio-geochemical interactions, as well as for the validation of high-resolution ocean models or serving as teaching material.
Bigger? Fatter? Or is faster growth better? Considerations on condition in larval and juvenile coral-reef fish
Publisher: Wiley
Date: 06-1998
The trophic basis of fish assemblages in temperate estuarine and coastal ecosystems
Publisher: Springer Science and Business Media LLC
Date: 07-01-2022
Population growth and transport of the red tide dinoflagellate, Noctiluca scintillans , in the coastal waters off Sydney Australia, using cell diameter as a tracer
Publisher: Wiley
Date: 03-2003
Mesozooplankton and Micronekton Active Carbon Transport in Contrasting Eddies
Publisher: Frontiers Media SA
Date: 21-01-2020
Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom
Publisher: Inter-Research Science Center
Date: 26-05-2011
DOI: 10.3354/MEPS09090
ILFC symposium. Growth and condition: Introduction
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960271
Spatial variability of recent otolith growth and RNA indices in pelagic juvenile Diaphus kapalae (Myctophidae): An effect of flow disturbance near an island?
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960273
Abstract: In February 1993, the pelagic juvenile myctophid Diaphus kapalae was s led with a neuston net in the southern Coral Sea in a region of flow disturbance north of Cato Reef, and to the east in the free stream (northerly flow at 30 cm s-1). There was no significant difference in the size (11-16 mm SL) or age (45-74 days after hatching) between the two regions. Recent growth indices derived from the width of the peripheral daily growth increments (~10 μm each) revealed enhanced otolith growth 38 km downstream and up to 4 days before capture. No significant difference was found for times longer than a week before capture, consistent with fluctuation of the wake indicated from current-meter data. Daily increment formation was confirmed by marginal increment analysis. Recent otolith growth was correlated with the RNA content adjusted by dry weight, which also revealed significantly higher condition in the wake region. Recent growth was correlated with microzooplankton biomass, recorded with an optical plankton counter.
An avenue of eddies: Quantifying the biophysical properties of mesoscale eddies in the Tasman Sea
Publisher: American Geophysical Union (AGU)
Date: 28-08-2012
DOI: 10.1029/2012GL053091
A global, historical database of tuna, billfish, and saury larval distributions
Publisher: Springer Science and Business Media LLC
Date: 19-07-2022
DOI: 10.1038/S41597-022-01528-7
Abstract: Knowing the distribution of fish larvae can inform fisheries science and resource management in several ways, by: 1) providing information on spawning areas 2) identifying key areas to manage and conserve and 3) helping to understand how fish populations are affected by anthropogenic pressures, such as overfishing and climate change. With the expansion of industrial fishing activity after 1945, there was increased s ling of fish larvae to help better understand variation in fish stocks. However, large-scale larval records are rare and often unavailable. Here we digitize data from Nishikawa et al . (1985), which were collected from 1956–1981 and are near-global (50°N–50°S), seasonal distribution maps of fish larvae of 18 mainly commercial pelagic taxa of the families Scombridae, Xiphiidae, Istiophoridae, Scombrolabracidae, and Scomberesocidae. Data were collected from the Pacific, Atlantic, and Indian Oceans. We present four seasonal 1° × 1° resolution maps per taxa representing larval abundance per grid cell and highlight some of the main patterns. Data are made available as delimited text, raster, and vector files.
Enhanced zooplankton abundance in the lee of an isolated reef in the south Coral Sea: the role of flow disturbance
Publisher: Oxford University Press (OUP)
Date: 1997
Estuarine gillnet fishery catch rates decline during drought in eastern Australia
Publisher: Elsevier BV
Date: 07-2009
Relative RNA content as a measure of condition in larval and juvenile fish
Publisher: CSIRO Publishing
Date: 1996
DOI: 10.1071/MF9960301
Abstract: The RNA:DNA ratio for first-feeding larvae (12 days after hatching, 4-6 mm standard length, SL) of Australian bass (Percichthyidae, Macquaria novemaculeata) exposed to four different feeding regimes over 8 days was found to be insensitive to the level of starvation. An alternative condition index based on residuals derived from the regression of RNA on SL showed significant differences over the course of the experiment these reflected the four feeding treatments. Field collections of juvenile monacanthids (Paramonacanthus otisensis, 10-30 mm SL) from a local estuary revealed no significant difference in RNA: DNA ratio at three sites over six weeks. A residual-based index (RNA on dry weight) showed parallel fluctuations at all sites they were positively correlated with water temperature. The RNA : DNA ratio depends on the difference in fluorescence between total nucleic acids (TNA, using thiazole orange) and DNA (using Hoechst 33258) to calculate RNA, as there is no RNA-specific fluorescent dye. The numerator is thus dependent on the denominator, and measurement error may be compounded in the ratio, exacerbating potential variability in the index. Ratios may also be variably correlated with age or size and consequently may erroneously indicate condition or growth in larger and faster-growing fish.
Zooplankton abundance and biomass size spectra in the East Antarctic sea-ice zone during the winter–spring transition
Publisher: Elsevier BV
Date: 09-2016
Evaluating estuarine nursery use and life history patterns of Pomatomus saltatrix in eastern Australia
Publisher: Inter-Research Science Center
Date: 28-06-2018
DOI: 10.3354/MEPS12495
Crabs Go With the Flow: Declining Conductivity and Cooler Temperatures Trigger Spawning Migrations for Female Giant Mud Crabs (Scylla serrata) in Subtropical Estuaries
Publisher: Springer Science and Business Media LLC
Date: 03-2022
DOI: 10.1007/S12237-022-01061-1
Abstract: Spawning is a key life history event for aquatic species that can be triggered by environmental signals. For estuarine-dependent species, the timing of such triggers can be important for determining future patterns in recruitment. Here, we used acoustic telemetry to identify the potential drivers of spawning migration in female Giant Mud Crabs ( Scylla serrata ). Eighty-nine mature female crabs were tagged in two subtropical south-east Australian estuaries, the Clarence River (~ 29.4°S) and Kalang River (~ 30.5°S), during the summer spawning season (November–June) over two years (2018/19 and 2020/21), and their movements were monitored for up to 68 d, alongside high-resolution environmental data. Crabs were considered to have ‘successfully’ migrated if they were detected at the mouth of the estuary, a behaviour exhibited by 52% of tagged crabs. The highest probability of migration was associated with relatively low temperatures ( 22 °C) and when conductivity rapidly declined ( -10 mS cm −1 d −1 ) following heavy rainfall. Furthermore, migration coincided with larger tides associated with the new and full moon, and following heavy rainfall, which may aid rapid downstream migration. Oceanic detections of 14 crabs (30% of ‘successful’ migrators) showed that once crabs left estuaries they migrated north. These patterns show that variability in environmental triggers for spawning migrations may contribute to interannual variation in spawning patterns, which may in turn impact fisheries productivity in this region.
The 13C, 15N and 34S signatures of a rocky reef planktivorous fish indicate different coastal discharges of sewage
Publisher: CSIRO Publishing
Date: 2004
DOI: 10.1071/MF03142
Abstract: We assessed the effects of primary, secondary and tertiary treated sewage on the stable isotope composition of the viscera and muscle of the zooplanktivorous eastern hula fish (Plesiopidae: Trachinops taeniatus). Fish were collected from three regions during three consecutive summer months for 2 years. In comparison to fish from control sites, the muscle δ15N of fish at outfall sites was significantly enriched by secondary and tertiary treated effluent. We estimate that 30–50% of nitrogen in hula fish near outfalls may be sewage-derived. The δ34S content of muscle was similar at all regions and sites (20–21‰), although it was significantly depleted by 1–2‰ at the tertiary treated outfall site. Detection of a comparatively minor volume of effluent ( ML day–1) in fish muscle may be due to its slower tissue turnover rate and the continuous discharge of effluent at outfall sites, compared to major yet sporadic rainfall or oceanographic events. The isotopic composition of hula fish from near a large primary treated sewage outfall off the coast of Sydney was not significantly different from one of the control sites, indicating a regional effect of four outfalls discharging ML day–1. With increasing upgrades to sewage treatment, stable isotopes may become useful tracers of anthropogenic nutrients in an oligotrophic environment.
A functional size-spectrum model of the global marine ecosystem that resolves zooplankton composition
Publisher: Elsevier BV
Date: 11-2020
Density-Dependent Energy Use Contributes to the Self-Thinning Relationship of Cohorts
Publisher: University of Chicago Press
Date: 03-2013
DOI: 10.1086/669146
Abstract: In resource-limited populations, an increase in average body size can occur only with a decline in abundance. This is known as self-thinning, and the decline in abundance in food-limited populations is considered proportional to the scaling of metabolism with body mass. This popular hypothesis may be inaccurate, because self-thinning populations can also experience density-dependent competition, which could alter their energy use beyond the predictions of metabolic scaling. This study tested whether density-dependent competition has an energetic role in self-thinning, by manipulating the abundance of the fish Macquaria novemaculeata and tank size to partition the effects of competition from metabolic scaling. We found that self-thinning can be density dependent and that changes in intraspecific competition may be more influential than metabolic scaling on self-thinning relationships. The energetic mechanism we propose is that density-dependent competition causes variation in the allocation of energy to growth, which alters the energetic efficiency of self-thinning cohorts. The implication is that food-limited cohorts and populations with competitive strategies that encourage fast-growing in iduals will have less body mass at equilibrium and higher mortality rates. This finding sheds light on the processes structuring populations and can be used to explain inconsistencies in the mass-abundance scaling of assemblages and communities (the energetic-equivalence rule).
Effect of phytoplankton community size structure on remote-sensing reflectance and chlorophyll a products
Publisher: Elsevier BV
Date: 11-2020
Vertically Resolved Pelagic Particle Biomass and Size Structure Across a Continental Shelf Under the Influence of a Western Boundary Current
Publisher: American Geophysical Union (AGU)
Date: 02-2023
DOI: 10.1029/2022JC018689
Abstract: Continental shelves are key to societal interactions with the oceans, supporting % of the world's fisheries through highly productive ecosystems. Previous research has shown that phytoplankton biomass is generally higher on the inner continental shelves, often due to increased nutrient inputs from upwelling or coastal run‐off. However, consistency in observed vertical and horizontal gradients (in abundance, biomass or size) of larger particulates, including zooplankton, on continental shelves has not been established. Using an optical plankton counter and CTD mounted on an undulating towed body, we present high‐resolution vertically resolved profiles of pelagic particle size structure across a continental shelf. Biomass was highest inshore, declining with distance from shore and with depth in the top 100 m of the water column, although the presence of frontal zones can alter this pattern. In the region adjacent to the East Australian Current (EAC), uplift generated by either the EAC interacting with the continental slope or upwelling‐favorable winds, correlated with smaller geometric mean sizes and steeper size spectrum slopes, particularly in the presence of frontal features. South of the EAC separation, the continental shelf water mass was more homogenous but still displayed the same horizontal and vertical patterns in particulate biomass and mean size. By combining our observations in a global comparison, we demonstrate consistent particulate distributions on continental shelves where the inner shelf has higher biomass with a steeper size spectrum slope compared to offshore. The highly productive inner shelf supports zooplankton communities vital to temperate ecosystems and coastal fisheries, through their consistently high biomass.
Plankton supports the majority of fish biomass on temperate rocky reefs
Publisher: Springer Science and Business Media LLC
Date: 11-03-2017
Rain-driven changes in fish dynamics: a switch from spatial to temporal segregation
Publisher: Inter-Research Science Center
Date: 28-05-2015
DOI: 10.3354/MEPS11285
Characteristic ichthyoplankton taxa in the separation zone of the East Australian Current: Larval assemblages as tracers of coastal mixing
Publisher: Elsevier BV
Date: 03-2011
Don’t Blame It on the Moonlight: Abiotic Drivers of Reproductive Development in an Estuarine-Dependent Prawn
Publisher: Springer Science and Business Media LLC
Date: 10-07-2018
The effect of surface flooding on the physical-biogeochemical dynamics of a warm-core eddy off southeast Australia
Publisher: Elsevier BV
Date: 03-2011
European Media Policy for the Twenty-First Century
Publisher: Routledge
Date: 29-01-2016
A database of chlorophyll a in Australian waters
Publisher: Springer Science and Business Media LLC
Date: 20-02-2018
Abstract: Chlorophyll a is the most commonly used indicator of phytoplankton biomass in the marine environment. It is relatively simple and cost effective to measure when compared to phytoplankton abundance and is thus routinely included in many surveys. Here we collate 173, 333 records of chlorophyll a collected since 1965 from Australian waters gathered from researchers on regular coastal monitoring surveys and ocean voyages into a single repository. This dataset includes the chlorophyll a values as measured from s les analysed using spectrophotometry, fluorometry and high performance liquid chromatography (HPLC). The Australian Chlorophyll a database is freely available through the Australian Ocean Data Network portal ( portal.aodn.org.au/ ). These data can be used in isolation as an index of phytoplankton biomass or in combination with other data to provide insight into water quality, ecosystem state, and relationships with other trophic levels such as zooplankton or fish.
Citizen science records describe the distribution and migratory behaviour of a piscivorous predator, Pomatomus saltatrix
Publisher: Oxford University Press (OUP)
Date: 16-05-2018
Abstract: Understanding the processes driving species distributions is a key question in ecology, yet obtaining pertinent data for many species can be challenging. Tag-recapture data from voluntary recreational fisheries programmes is an undervalued citizen science data resource and can provide valuable observation records for data-poor species. Here, we highlight the utility of such data by compiling four tag-recapture datasets (n = 20 878 tags) to describe the movements and distribution of a piscivorous predator, tailor Pomatomus saltatrix, with respect to their environment. We compared species distribution models that explored a trade-off between temporal duration and spatial extent. Both models revealed sea surface temperature (SST) was an important factor in describing the distribution and density of tailor. However, the model with broader spatial extent indicated a non-linear response to SST, peaking at 21.5°C, while the model with temporal longevity showed a linear SST response. This disjunct showcases the importance of building models across an adequate geographic extent to ensure covariate responses are not truncated. This is the first study to comprehensively describe the distribution and migrations of adult tailor across their eastern Australian distribution. The results are discussed in light of ocean warming along eastern Australia, and the subsequent implications for using tag-recapture data in fisheries management.
Recent growth rate of larval pilchards Sardinops sagax in relation to their stable isotope composition, in an upwelling zone of the East Australian Current
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04221
Abstract: The recent growth rate and stable isotope composition of larval pilchards, (Sardinops sagax, 6–29 mm standard length), captured in surface and near-surface waters, were examined in coastal upwelling and non-upwelling regions of the East Australian Current over two cruises during the austral summer of 1998/1999. Compared to the non-upwelled regions, larvae were larger in the upwelling regions, and yet the back-calculated recent growth over 2 days before capture was significantly less on both cruises. This surprising result is consistent with slower larval growth of this species near coastal Japan and California, where strong year classes may form in offshore waters. δ15N ratios were significantly correlated with larval length, indicating ontogeny in their diet. In November, slower growers in upwelled waters were enriched in δ15N and depleted in δ13C, consistent with expected ratios from diets derived from deeper water. The pilchard’s early life history off eastern Australia is proposed and compared with that off eastern Japan.
Monitoring boat-based recreational fishing effort at a nearshore artificial reef with a shore-based camera
Publisher: Elsevier BV
Date: 09-2016
The legacy of Johan Hjort: challenges and critical periods—past, present, and future
Publisher: Oxford University Press (OUP)
Date: 24-12-2020
Abstract: The 150th anniversary of Johan Hjort’s birth was celebrated by a symposium held in Bergen on 12–14 June 2019 to take a broad perspective on the origins of, and developments in, fisheries science and thereby examine current issues in fisheries science from different perspectives. To establish this type of non-traditional forum, historians of marine science and marine researchers from around the world met to explore potential new directions. The many transdisciplinary panel discussions, especially on subjects such as “the making of fisheries scientists”, revealed the pervading influence of family, educators, role models, and social circumstances. The 11 articles included in this symposium issue present a series of advancements in modern fisheries science, highlighting the contributions of Hjort and his contemporaries, Fyodor Baranov and Harald Dannevig. As expected, the effects of changing ocean climate were a dominant theme, which connected this symposium, and complemented, the 2014 symposium in honour of Johan Hjort's influential treatise released in 1914. Although no ground-breaking paradigms were presented, several new research directions were proposed in a creative atmosphere generated by participants. The social context of science had a key influence in Hjort’s day and continues to do so today and into the future.
Entrainment and advection of larval sardine, Sardinops sagax, by the East Australian Current and retention in the western Tasman Front
Publisher: Wiley
Date: 11-2014
DOI: 10.1111/FOG.12089
Corrigendum: Mesozooplankton and Micronekton Active Carbon Transport in Contrasting Eddies
Publisher: Frontiers Media SA
Date: 04-09-2020
Modelling the distribution of larval fish in a western boundary current using a multi-voyage database
Publisher: Springer Science and Business Media LLC
Date: 18-03-2021
Spatial and temporal variability in the condition of postlarval and juvenile Penaeus plebejus sampled from a population subjected to pilot releases
Publisher: Inter-Research Science Center
Date: 14-07-2011
DOI: 10.3354/AEI00026
Rain reverses diel activity rhythms in an estuarine teleost
Publisher: The Royal Society
Date: 07-01-2013
Abstract: Activity rhythms are ubiquitous in nature, and generally synchronized with the day–night cycle. Several taxa have been shown to switch between nocturnal and diurnal activity in response to environmental variability, and these relatively uncommon switches provide a basis for greater understanding of the mechanisms and adaptive significance of circadian (approx. 24 h) rhythms. Plasticity of activity rhythms has been identified in association with a variety of factors, from changes in predation pressure to an altered nutritional or social status. Here, we report a switch in activity rhythm that is associated with rainfall. Outside periods of rain, the estuarine-associated teleost Acanthopagrus australis was most active and in shallower depths during the day, but this activity and depth pattern was reversed in the days following rain, with diurnality restored as estuarine conductivity and turbidity levels returned to pre-rain levels. Although representing the first ex le of a rain-induced reversal of activity rhythm in an aquatic animal of which we are aware, our results are consistent with established models on the trade-offs between predation risk and foraging efficiency.
Fish Movement Through an Estuary Mouth Is Related to Tidal Flow
Publisher: Springer Science and Business Media LLC
Date: 22-10-2015
Growth histories derived from otolith microstructure of three Norwegian cod stocks co-reared in mesocosms; effect of initial size and prey size changes
Publisher: Oxford University Press (OUP)
Date: 10-1999
Population ecology of Noctiluca scintillans Macartney, a red-tide-forming dinoflagellate
Publisher: CSIRO Publishing
Date: 1999
DOI: 10.1071/MF98052
Abstract: The population ecology of the large heterotrophic dinoflagellate Noctiluca scintillans Macartney was examined in the coastal ocean and two estuaries in south-eastern Australia from July 1996 to June 1997. High concentrations ( cells L–1) occurred in spring and again in late summer, and low concentrations ( cells L–1) in mid summer and mid winter. Abundances were greater in coastal waters than in the estuaries during all months in which concentration exceeded 1 cell L–1. During the spring bloom, Noctiluca cells from coastal stations had small diameters (340–450 µm), a high nutritional status and a high proportion of ision stages, indicative of good condition. During the late summer blooms, poor-condition cells were found in coastal waters and especially in the near-surface concentrations of red tides ( cells L–1), and were characterized by large diameters (400–1200 µm), cell lysis and uniformly low nutritional status at this time, Noctiluca cells from estuaries were generally fewer, smaller and in better condition. Overall, cell concentrations were higher in coastal waters than in the estuaries, and red tides of Noctiluca probably developed along the local coast (in spring) or were advected into the area from northern regions (in late summer).
Consistent timing of juvenile fish recruitment to seagrass beds within two Sydney estuaries
Publisher: CSIRO Publishing
Date: 2000
DOI: 10.1071/MF99142
Abstract: Recruitment patterns of juvenile Rhabdosargus sarba (Sparidae) and Pelates sexlineatus (Terapontidae) were examined by frequent (1–4 weeks) beach seining of seagrass beds in Sydney, south-east Australia. Two sites within each of two estuaries (Botany Bay and Pitt Water) were s led for one year. One site within Botany Bay was s led for 3 years. A total of 12 824 juveniles of R. sarba and 7037 juveniles of P. sexlineatus were collected. R. sarba recruited in 4 pulses during winter/spring, while P. sexlineatus recruited in 6 pulses during summer/autumn, and the timing of recruitment events was consistent among locations and years. P. sexlineatus recruitment coincided with new moons, but R. sarba recruitment dates were less precisely determined. Predictable annual recruitment patterns result in temporal partitioning of seagrass habitat between these two abundant estuarine species. Spatial differences in magnitude of recruitment events among sites reflected patterns of estuarine circulation.
Role of Hypoxia in Limiting Diel Spring and Summer Distribution of Juvenile Yellow Perch (Perca flavescens) in a Prairie Marsh
Publisher: Canadian Science Publishing
Date: 08-1986
DOI: 10.1139/F86-194
Abstract: Comparative field and laboratory data on the distribution-limiting levels of dissolved oxygen (DO) for yearling yellow perch (Perca flavescens) is presented. At Blind Channel, Delta Marsh, Manitoba, diel fluctuations in DO concentrations began by June, approximately 6 wk after ice-off. By early July severe hypoxia (≤ 1.5 ppm DO) first occurred in the cattail habitat close to the substrate at dawn, and by early August severe hypoxia extended throughout the cattail bed. Using wire minnow traps, juvenile perch persisted within the cattails close to the substrate in June. In early July, juvenile perch occupied the submerged macrophyte – open water habitat, away from the cattail and hypoxia. Significant diel changes in horizontal distribution were evident at one site, where fish avoided severe hypoxia in the cattail bed overnight but returned during the day, as there was little alternative cover and when DO levels were not lethal. In situ survival experiments demonstrated decreased survival close to the substrate, in the cattail, and overnight compared with overday, reflecting the distribution of low DO. Survival increased 27% over the control by bubbling oxygen into holding cages. In a two-chambered normoxic/hypoxic tank, perch demonstrated a preference for cover, and avoidance of hypoxia at 1.5–3.0 ppm DO. The habitat choice of juvenile yellow perch in Delta Marsh is a compromise between the cattail, with favorable predator rey conditions, and hypoxia.
Intercalibration of four spectrofluorometric protocols for measuring RNA/DNA ratios in larval and juvenile fish
Publisher: Wiley
Date: 05-2006
A database of marine larval fish assemblages in Australian temperate and subtropical waters
Publisher: Springer Science and Business Media LLC
Date: 16-10-2018
Abstract: Larval fishes are a useful metric of marine ecosystem state and change, as well as species-specific patterns in phenology. The high level of taxonomic expertise required to identify larval fishes to species level, and the considerable effort required to collect s les, make these data very valuable. Here we collate 3178 s les of larval fish assemblages, from 12 research projects from 1983-present, from temperate and subtropical Australian pelagic waters. This forms a benchmark for the larval fish assemblage for the region, and includes recent monitoring of larval fishes at coastal oceanographic reference stations. Comparing larval fishes among projects can be problematic due to differences in taxonomic resolution, and identifying all taxa to species is challenging, so this study reports a standard taxonomic resolution (of 218 taxa) for this region to help guide future research. This larval fish database serves as a data repository for surveys of larval fish assemblages in the region, and can contribute to analysis of climate-driven changes in the location and timing of the spawning of marine fishes.
Novel fisheries investigations by Harald Dannevig: some parallels with Johan Hjort on the other side of the world
Publisher: Oxford University Press (OUP)
Date: 25-01-2020
Abstract: Harald Dannevig was Australia’s first Director of fisheries research and Director of Australia’s first ocean-going research vessel. Dannevig’s initial contributions concerned hatchery technology, freshwater fisheries, and impacts of estuarine prawn trawling. Later, he revealed the growth and migration of sea mullet, the spawning of pelagic eggs in the coastal ocean, and he was the first to demonstrate the effect of onshore winds on recruitment to estuarine fisheries. Using plans of the first Norwegian research trawler Michael Sars, he advised on the construction and commissioning of Endeavour. He organized 99 research voyages over 6 years to determine suitable trawling grounds over ∼7000 km, discovering 263 new species, including 96 new fish species and ∼5000 catalogued specimens. Harald Dannevig’s significant achievements in Australia were soon forgotten after his death with the loss of Endeavour in the Southern Ocean at the beginning of World War I. Both Johan Hjort and Dannevig were numerate, loved natural history, and were keenly observant on the deck. As these two scientists did not correspond, their innovative and parallel thinking stems from the shared university environment with G.O. Sars, and the rapport between Sars and Harald’s father Gunder Dannevig, concerning the fish hatchery and stocking of larval cod.
Zooplankton biomass gradient off south-western Nova Scotia: Nearshore ctenophore predation or hydrographic separation?
Publisher: Oxford University Press (OUP)
Date: 1990
Generalist niche, specialist strategy: the diet of an Australian percichthyid
Publisher: Wiley
Date: 04-2011
DOI: 10.1111/J.1095-8649.2011.02926.X
Abstract: Dietary analysis revealed that an impoundment population of Australian bass Macquaria novemaculeata holds a generalist niche, but one arising from persistent in idual specialization and interin idual variation. This 'in idual specialist' strategy appeared adaptive, but the strength of in idual specialization was largely independent of variation in diet composition, except during blooms of Daphnia sp. Diet composition and dietary overlap showed only moderate ontogenetic variation, and niche breadth showed no relationship with ontogeny. Macquaria novemaculeata showed an asymmetric predator and prey size distribution, consistent with many aquatic predators, with positive relationships between fish size and average, maximum and minimum prey size. There was no asymmetry in the relative size-based niche breadths of in iduals, however, which indicates that the niche is a fixed 'window' of relative prey sizes. The difference in the dietary niche and prey-size relationships of M. novemaculeata at the population and in idual levels highlights the necessity of assessing the niche at both these levels.
A database of zooplankton biomass in Australian marine waters
Publisher: Springer Science and Business Media LLC
Date: 08-09-2020
DOI: 10.1038/S41597-020-00625-9
Abstract: Zooplankton biomass data have been collected in Australian waters since the 1930s, yet most datasets have been unavailable to the research community. We have searched archives, scanned the primary and grey literature, and contacted researchers, to collate 49187 records of marine zooplankton biomass from waters around Australia (0–60°S, 110–160°E). Many of these datasets are relatively small, but when combined, they provide years of zooplankton biomass data for Australian waters from 1932 to the present. Data have been standardised and all available metadata included. We have lodged this dataset with the Australian Ocean Data Network, allowing full public access. The Australian Zooplankton Biomass Database will be valuable for global change studies, research assessing trophic linkages, and for initialising and assessing biogeochemical and ecosystem models of lower trophic levels.
The effects of substratum material and surface orientation on the developing epibenthic community on a designed artificial reef
Publisher: Informa UK Limited
Date: 14-09-2016
DOI: 10.1080/08927014.2016.1224860
Abstract: Artificial reefs provide shelter and can be an important source of food for fish depending on the epibenthic community on the structure. The growth and ersity of this community is influenced by the substratum material and the surface orientation of the reef. Settlement plates of four materials (Perspex, sandstone, wood and steel) were deployed in three orientations (upwards, downwards and vertical) at a depth of 33 m on a designed artificial reef (DAR) off the coast of Sydney, Australia. After three months, the steel surfaces had lower invertebrate species richness, total abundance and ersity compared to other surfaces. Steel was not an ideal material for the initial recruitment and growth of epibenthic invertebrates. A longer duration would be required to develop a mature epibenthic community. Surface orientation had species-specific impacts. Surface material and orientation are important factors for developing epibenthic assemblages, and are thus likely to affect the broader artificial reef assemblage, including fish.
Contrasting phytoplankton composition and primary productivity in multiple mesoscale eddies along the East Australian coast
Publisher: Elsevier BV
Date: 03-2023
The abundance of juvenile yellowtail (Seriola quinqueradiata) near the Kuroshio: The roles of drifting seaweed and regional hydrography
Publisher: Wiley
Date: 12-06-2006
Key habitat and home range of mulloway Argyrosomus japonicus in a south-east Australian estuary: finding the estuarine niche to optimise stocking
Publisher: Inter-Research Science Center
Date: 20-12-2006
DOI: 10.3354/MEPS328237
Colonization and community development of fish assemblages associated with estuarine artificial reefs
Publisher: FapUNIFESP (SciELO)
Date: 2011
DOI: 10.1590/S1679-87592011000500008
Abstract: Despite the long history of the development of artificial structures in NSW estuaries there are no studies that provide any comprehensive scientific evaluation of post-deployment goals. We assessed the effectiveness of estuarine artificial reefs as a fisheries enhancement initiative described the ersity and abundance of species associated with them, and detailed the patterns of colonization and community development associated with an artificial reef deployment in Lake Macquarie, a large coastal barrier lagoon on the southeast coast of Australia. Six artificial reefs (one artificial reef group), constructed from artificial reef units (Reef Balls®), were deployed in December 2005 and s led six times per season over two years using baited remote underwater video (BRUV). Colonization of the artificial reef group was relatively rapid with the majority of species identified over the two-year study period observed within the first year post-deployment. Overall, 27 species from 17 families were identified. Key colonising species included Pelates sexlineatus (Terapontidae), Acanthopagrus australis (Sparidae), Pagrus auratus (Sparidae) and Rhabdosargus sarba (Sparidae). Species richness showed evidence of potential seasonal fluctuations, being higher in warm water months (Summer/Autumn), and lower in the colder water months (Winter/Spring), while species ersity increased significantly with reef age. Fish assemblage composition remained relatively stable after the first year of s ling, with few discernible patterns in assemblage structure evident after the first year. Distinct separation in reef age groupings was evident during the second year of s ling a pattern primarily driven by a decrease in abundance of P. sexlineatus, a result of the isolated nature of the artificial reefs and the interrelated effects of density dependence and predation.
Response of fish communities to the deployment of estuarine artificial reefs for fisheries enhancement
Publisher: Wiley
Date: 08-09-2014
DOI: 10.1111/FME.12048
Responsible estuarine finfish stock enhancement: an Australian perspective
Publisher: Wiley
Date: 08-2005
Integrated approach to determining stock structure: implications for fisheries management of sardine, Sardinops sagax, in Australian waters
Publisher: Springer Science and Business Media LLC
Date: 27-01-2017
Mesoscale distribution of larval Euphausia similis in various water masses of the East Australian Current
Publisher: Elsevier BV
Date: 10-2010
Temperature dependence of fish performance in the wild: links with species biogeography and physiological thermal tolerance
Publisher: Wiley
Date: 16-01-2016
Effects of habitat on fish abundance and species composition on temperate rocky reefs
Publisher: Inter-Research Science Center
Date: 15-12-2016
DOI: 10.3354/MEPS11927
Dynamic estuarine plumes and fronts: importance to small fish and plankton in coastal waters of NSW, Australia
Publisher: Elsevier BV
Date: 05-1994
Age and growth of Pomatomus saltatrix in the south-western Pacific Ocean (eastern Australia), with a global comparison
Publisher: CSIRO Publishing
Date: 14-03-2023
DOI: 10.1071/MF22216
Abstract: Context Pomatomus saltatrix is one of few globally distributed pelagic mesopredators that is exploited heavily throughout its range. Despite the implementation of management strategies, the south-western Pacific Ocean (eastern Australian) population has few published estimates of the key life-history parameters including growth. Aims To estimate the age and growth of P. saltatrix in the south-western Pacific and compare these with the age and growth in other populations. Methods Age estimates were made using whole otolith readings and an age–length key was used with a length frequency distribution to estimate the age structure of the population. Eight different growth models were compared within a Bayesian framework for both juvenile and overall growth. Key results The Schnute growth equation provided the best fit for overall growth and yielded parameter values of a = −0.15, b = 2.56, Size-at-age 1 = 24.38-cm fork length (FL) and Size-at-age 4 = 47.36 cm FL. Conclusions P. saltatrix in the south-western Pacific has a growth rate similar to that in other populations of P. saltatrix. Implications Despite its geographically and genetically distinct populations, P. saltatrix demonstrates a generally consistent life-history strategy of fast growth and high mortality, except for the north-western Atlantic population, which has lower mortality.
Evaluation of a novel research trap for surveys of blue swimmer crab populations
Publisher: CSIRO Publishing
Date: 03-05-2022
DOI: 10.1071/MF21005
Abstract: Surveying free-ranging crab populations is important for monitoring the health of exploited stocks and predicting future productivity. Here, we present a novel research trap design for use in fisheries-independent surveys of blue swimmer crab (Portunus armatus) populations, and evaluate the trap against some existing approaches within an independent survey framework. Specifically, the trap design aimed to improve efficiency for capturing smaller crabs, without adversely affecting catches of larger crabs. We quantify and report the abundance and selectivity of these traps, relative to co-located s les obtained using beam trawls and standard commercial round traps, to establish whether these small-mesh traps may offer any improvements over existing survey methods. Comparison and evaluation of these small-mesh traps against other existing survey gear, in different places and at different times, showed that the traps are more effective at catching smaller crabs when they are present, and equally or more effective at catching larger size classes of crabs. The beam trawl appeared to be effective at capturing a reasonable size range of crabs however, the number of crabs caught (using a similar investment of time) was substantially lower than that caught in traps. This novel small-mesh research trap appears suitable for fisheries-independent surveys of portunid crab species.
Coupled physical-biological modelling study of the East Australian Current with idealised wind forcing. Part I: Biological model intercomparison
Publisher: Elsevier BV
Date: 02-2006
Population drivers of aThalia democraticaswarm: insights from population modelling
Publisher: Oxford University Press (OUP)
Date: 22-04-2015
Coupled physical-biological modelling study of the East Australian Current with idealised wind forcing: Part II. Biological dynamical analysis
Publisher: Elsevier BV
Date: 02-2006
Large Vertical Migrations of Pyrosoma atlanticum Play an Important Role in Active Carbon Transport
Publisher: American Geophysical Union (AGU)
Date: 05-2019
DOI: 10.1029/2018JG004918
Post‐release monitoring of site and group fidelity in acoustically tagged stocked fish
Publisher: Wiley
Date: 09-05-2013
DOI: 10.1111/FME.12031
Shelf Transport Pathways Adjacent to the East Australian Current Reveal Sources of Productivity for Coastal Reefs
Publisher: Frontiers Media SA
Date: 07-01-2022
DOI: 10.3389/FMARS.2021.789687
Abstract: The region where the East Australian Current (EAC) separates from the coast is dynamic and the shelf circulation is impacted by the interplay of the western boundary current and its eddy field with the coastal ocean. This interaction can drive upwelling, retention or export. Hence understanding the connection between offshore waters and the inner shelf is needed as it influences the productivity potential of valuable coastal rocky reefs. Near urban centres, artificial reefs enhance fishing opportunities in coastal waters, however these reefs are located without consideration of the productivity potential of adjacent waters. Here we identify three dominant modes of mesoscale circulation in the EAC separation region (~31.5−34.5°S) the ‘EAC mode’ which dominates the flow in the poleward direction, and two eddy modes, the ‘EAC eddy mode’ and the ‘Eddy dipole mode’, which are determined by the configuration of a cyclonic and anticyclonic eddy and the relationship with the separated EAC jet. We use a Lagrangian approach to reveal the transport pathways across the shelf to understand the impact of the mesoscale circulation modes and to explore the productivity potential of the coastal waters. We investigate the origin (position and depth) of the water that arrives at the inner-mid shelf over a 21-day period (the plankton productivity timescale). We show that the proportion of water that is upwelled from below the euphotic zone varies spatially, and with each mesoscale circulation mode. Additionally, shelf transport timescales and pathways are also impacted by the mesoscale circulation. The highest proportion of upwelling (70%) occurs upstream of 32.5°S, associated with the EAC jet separation, with vertical displacements of 70–120 m. From 33 to 33.5°S, water comes from offshore above the euphotic layer, and shelf transport timescales are longest. The region of highest retention over the inner shelf is immediately downstream of the EAC separation region. The position of the EAC jet and the location of the cyclonic eddy determines the variability in shelf-ocean interactions and the productivity of shelf waters. These results are useful for understanding productivity of temperate rocky reefs in general and specifically for fisheries enhancements along an increasingly urbanised coast.
Plankton dynamics due to rainfall, eutrophication, dilution, grazing and assimilation in an urbanized coastal lagoon
Publisher: Elsevier BV
Date: 08-2009
Dispersal of Eastern King Prawn larvae in a western boundary current: New insights from particle tracking
Publisher: Wiley
Date: 21-03-2017
DOI: 10.1111/FOG.12213
Hitchhiking in the East Australian Current: rafting as a dispersal mechanism for harmful epibenthic dinoflagellates
Publisher: Inter-Research Science Center
Date: 09-02-2023
DOI: 10.3354/MEPS12579
Bioenergetic Model Sensitivity to Diet Diversity Across Space, Time and Ontogeny
Publisher: Frontiers Media SA
Date: 18-08-2021
DOI: 10.3389/FMARS.2021.625855
Abstract: Consumption is the primary trophic interaction in ecosystems and its accurate estimation is required for reliable ecosystem modeling. When estimating consumption, species’ diets are commonly assumed to be the average of those that occur among habitats, seasons, and life stages which introduces uncertainty and error into consumption rate estimates. We present a case study of a teleost (Yellowfin Bream Acanthopagrus australis ) that quantifies the potential error in consumption (in mass) and growth rate estimates when using diet data from different regions and times and ignoring ontogenetic variability. Ontogenetic diet trends were examined through gut content analysis ( n = 1,130 fish) and incorporated into a bioenergetic model (the “primary” model) that included diet variability ( n = 144 prey sources) and ontogenetic changes in metabolism (1–7 year) to estimate lifetime consumption. We quantified error by building nine model scenarios that each incorporated different spatiotemporal diet data of four published studies. The model scenarios produced in idual lifetime consumption estimates that were between 25% lower and 15% higher than the primary model (maximum difference was 53%, range 11.7–17.8 kg). When consumption (in mass) was held constant, differences in diet quality among models caused a several-fold range in growth rate (0.04–1.07 g day –1 ). Our findings showcase the large uncertainty in consumption rate estimates due to diet ersity, and illustrate that caution is required when considering bioenergetic results among locations, times, and ontogeny.
The bioenergetics of a coastal forage fish: Importance of empirical values for ecosystem models
Publisher: Elsevier BV
Date: 05-2020
Competition between wild and captive-bred Penaeus plebejus and implications for stock enhancement
Publisher: Inter-Research Science Center
Date: 29-03-2012
DOI: 10.3354/MEPS09600
Bioenergetics of blue swimmer crab (
Publisher: CSIRO Publishing
Date: 12-05-2021
DOI: 10.1071/MF20363
Abstract: Stock enhancement is a contemporary management method employed to support fisheries productivity. Blue swimmer crab (Portunus armatus) is a widely distributed species that has been identified as a candidate for stock enhancement however, the release strategy and ecological impact of releases have not yet been assessed. Here, we (1) quantify the bioenergetics of blue swimmer crab, (2) estimate consumption rates, and (3) develop these relationships in a stocking model to assess appropriate release densities and associated trophic impacts. Static respirometry was used to measure the resting metabolic rate (RMR) of blue swimmer crab at three temperatures (19, 24, and 29°C). RMR was found to increase with temperature (Q10 = 2.32), and was 73% higher when crabs were at a premoult or moulting stage. Parameters derived from respirometry experiments were applied to estimate blue swimmer crab stocking density in a south-eastern Australian estuary, by adapting an existing production-based simulation model. The model estimated a median stocking density of ~1.2 crabs per 100 m2. A sensitivity analysis showed that the growth rate was the most influential parameter in this model, showing the importance of this parameter when assessing stocking scenarios.
Nutrient and plankton dynamics in an intermittently closed/open lagoon, Smiths Lake, south-eastern Australia: An ecological model
Publisher: Elsevier BV
Date: 05-2007
Insights into fish auditory structure–function relationships from morphological and behavioural ontogeny in a maturing sciaenid
Publisher: Springer Science and Business Media LLC
Date: 09-01-2020
Comparison of baited remote underwater video (BRUV) and underwater visual census (UVC) for assessment of artificial reefs in estuaries
Publisher: Elsevier BV
Date: 04-2012
Characterizing the three‐dimensional distribution of schooling reef fish with a portable multibeam echosounder
Publisher: Wiley
Date: 30-03-2021
DOI: 10.1002/LOM3.10427
An observation of two oceanic salp swarms in the Tasman Sea: Thetys vagina and Cyclosalpa affinis
Publisher: Springer Science and Business Media LLC
Date: 06-2016
Fine-scale movements, site fidelity and habitat use of an estuarine dependent sparid
Publisher: Springer Science and Business Media LLC
Date: 11-02-2015
A function-based typology for Earth’s ecosystems
Publisher: Springer Science and Business Media LLC
Date: 12-10-2022
DOI: 10.1038/S41586-022-05318-4
Abstract: As the United Nations develops a post-2020 global bio ersity framework for the Convention on Biological Diversity, attention is focusing on how new goals and targets for ecosystem conservation might serve its vision of ‘living in harmony with nature’ 1,2 . Advancing dual imperatives to conserve bio ersity and sustain ecosystem services requires reliable and resilient generalizations and predictions about ecosystem responses to environmental change and management 3 . Ecosystems vary in their biota 4 , service provision 5 and relative exposure to risks 6 , yet there is no globally consistent classification of ecosystems that reflects functional responses to change and management. This h ers progress on developing conservation targets and sustainability goals. Here we present the International Union for Conservation of Nature (IUCN) Global Ecosystem Typology, a conceptually robust, scalable, spatially explicit approach for generalizations and predictions about functions, biota, risks and management remedies across the entire biosphere. The outcome of a major cross-disciplinary collaboration, this novel framework places all of Earth’s ecosystems into a unifying theoretical context to guide the transformation of ecosystem policy and management from global to local scales. This new information infrastructure will support knowledge transfer for ecosystem-specific management and restoration, globally standardized ecosystem risk assessments, natural capital accounting and progress on the post-2020 global bio ersity framework.
A plankton population model with biomechanical descriptions of biological processes in an idealised 2D ocean basin
Publisher: Elsevier BV
Date: 10-2004
Connectivity but not recruitment: Response of the fish community to a large‐scale flood on a heavily regulated floodplain
Publisher: Wiley
Date: 31-01-2020
DOI: 10.1002/ECO.2194
Size-selective predation by three estuarine zooplanktivorous fish species
Publisher: CSIRO Publishing
Date: 04-05-2022
DOI: 10.1071/MF21344
Abstract: Context Zooplanktivorous fish are a key link between abundant zooplankton and higher trophic levels but the foraging behaviour of zooplanktivorous fish is not fully understood. Selective feeding behaviours have been observed, with many species of planktivorous fish targeting certain species and sizes of zooplankton for prey. However, why certain size classes of zooplankton are preferred remains unclear. Aim This study investigated prey selection by three zooplanktivorous fish species through the lens of optimal foraging theory. Methods We assessed the size structure of zooplankton in the environment and compared this with the size distribution of zooplankton in gut contents from three zooplanktivorous fish. Key results The targeted prey size of Atypichthys strigatus and Scorpis lineolata aligns with the prey size classes in the environment that contain the highest overall biomass. Trachurus novaezelandiae showed little evidence of targeting these size classes. Conclusions These prey sizes therefore represent the most efficient prey to target because the return on foraging effort is greatest. By contrast, T. novaezelandiae showed only an underselection of large and small prey. Implications By incorporating this information on this key trophic link between zooplankton and fish, ecosystem models could better resolve the size dependant predation, particularly in size-based models.
Entrainment of larval fish assemblages from the inner shelf into the East Australian Current and into the western Tasman Front
Publisher: Wiley
Date: 26-07-2011
Increasing model structural complexity inhibits the growth of initial condition errors
Publisher: Elsevier BV
Date: 12-2010
Rethinking the Role of Salps in the Ocean
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.TREE.2016.06.007
Abstract: Salps are barrel-shaped, gelatinous zooplankton that regularly form large swarms. They have historically been ignored because they are difficult to s le and their gelatinous body structure suggests that they are unimportant in food webs and biogeochemical cycles. We collate evidence to overturn several common misconceptions about salps that have h ered research. We show that salps play a major role in carbon sequestration and are key components of marine food webs as a food source for at least 202 species including fish, turtles, and crustaceans. The future of salps in the Anthropocene is uncertain, and therefore further research into areas such as basic rate processes and their biogeochemical impact through new and innovative laboratory and field methods is needed.
Demography and interannual variability of salp swarms (Thalia democratica)
Publisher: Springer Science and Business Media LLC
Date: 15-09-2014
Artificial reefs increase fish abundance in habitat‐limited estuaries
Publisher: Wiley
Date: 15-06-2020
Top-down pressure on small pelagic fish by eastern Australian salmon Arripis trutta; estimation of daily ration and annual prey consumption using multiple techniques
Publisher: Elsevier BV
Date: 10-2014
A predatory impact model and targeted stock enhancement approach for optimal release of mulloway (Argyrosomus japonicus)
Publisher: Informa UK Limited
Date: 20-02-2008
Frontal eddies provide an oceanographic triad for favorable larval fish habitat
Publisher: Wiley
Date: 28-02-2023
DOI: 10.1002/LNO.12326
Abstract: Frontal eddies form on the shoreward edge of boundary currents, on average at weekly intervals and can last up to several weeks. This duration allows zooplankton production and completion of the larval stage of fish but may be too ephemeral for longer food chains with planktonic predators to establish. Therefore, frontal eddies may provide a suitable offshore nursery habitat, by entraining and retaining inner‐shelf water, preconditioned with coastal plankton and ichthyoplankton, into an upwelling favorable cyclonic eddy. Here, we briefly describe the behavior of frontal eddies formed by western boundary currents in the context of the fundamental ocean triad, which incorporates three processes for the successful reproduction of fish: nutrient enrichment, food concentration, and retention of larvae. We adapt this hypothesis for frontal eddies adjacent to the substantial fisheries production of continental shelves, creating conditions for enhanced recruitment potential of larval cohorts at a finer scale than previously considered. We review the evidence and investigations of frontal eddies in their capacity to entrain coastal water, sustain the plankton community through eddy uplift and retain distinctive coastal communities of larval fish offshore until larval development is complete. The process of frontal eddy formation is complex and such habitats are irregular yet ubiquitous, which present challenges and opportunities for their study. With the advance of ocean observing systems and integration of physical and biological s ling, frontal eddies provide a novel focus for understanding fisheries production and connectivity of coastal ecosystems.
Functional traits explain trophic allometries of cephalopods
Publisher: Wiley
Date: 28-09-2020
Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries
Publisher: Wiley
Date: 07-09-2022
DOI: 10.1111/FOG.12561
Abstract: Coastal winds transport water masses and larval fish onshore or offshore which may influence estuarine recruitment, yet our understanding of the mechanism underlying this relationship is limited. Here, we combine datasets from a historical database of larval fish off southeast Australia with a high‐resolution atmospheric reanalysis model to show that normalised abundance of coastally spawned larvae increased with weak to moderate upwelling favourable winds 14 days prior to s ling. The increase in abundance may reflect increased nutrient and plankton availability for larval fish. Normalised larval abundance decreased following strong upwelling favourable winds but increased after onshore (downwelling favourable) winds, due to wind‐driven transport. By combining a commercial estuarine fisheries catch‐rate dataset (4 species, 8 estuaries, 10 years) and the high‐resolution atmospheric reanalysis model, we show that negative effects of upwelling favourable winds during the spawning period can be detected in lagged estuarine commercial fisheries catch rates (lagged by 2–8 years depending on species' growth rates), potentially representing the same mechanism proposed for larval fish. Upwelling favourable winds in the southeast Australian region have increased since 1850 while onshore winds have decreased, which may have reduced larval recruitment to estuaries. Coastal winds are likely an important factor for estuarine recruitment in the southeast Australian region and future research on the estuarine recruitment of fish should incorporate coastal winds.
The influence of ontogenetic diet variation on consumption rate estimates: a marine example
Publisher: Springer Science and Business Media LLC
Date: 16-07-2018
DOI: 10.1038/S41598-018-28479-7
Abstract: Consumption rates are the foundation of trophic ecology, yet bioenergetics models used to estimate these rates can lack realism by not incorporating the ontogeny of diet. We constructed a bioenergetics model of a marine predatory fish (tailor, Pomatomus saltatrix ) that incorporated high-resolution ontogenetic diet variation, and compared consumption estimates to those derived from typical bioenergetics models that do not consider ontogenetic diet variation. We found tailor consumption was over- or under-estimated by ~5–25% when only including the most common prey item. This error was due to a positive relationship between mean prey energy density and predator body size. Since high-resolution diet data isn’t always available, we also simulated how increasing dietary information progressively influenced consumption rate estimates. The greatest improvement in consumption rate estimates occurred when diet variation of 2–3 stanzas (1–2 juvenile stanzas, and adults) was included, with at least 5–6 most common prey types per stanza. We recommend increased emphasis on incorporating the ontogeny of diet and prey energy density in consumption rate estimates, especially for species with spatially segregated life stages or variable diets. A small-moderate increase in the resolution of dietary information can greatly benefit the accuracy of estimated consumption rates. We present a method of incorporating variable prey energy density into bioenergetics models.
Estimating the recreational harvest of fish from a nearshore designed artificial reef using a pragmatic approach
Publisher: Elsevier BV
Date: 03-2017
Attracting juvenile fish into Tube Fishways – roles of transfer chamber diameter and flow velocity
Publisher: Elsevier BV
Date: 03-2022
Improving consumption rate estimates by incorporating wild activity into a bioenergetics model
Publisher: Wiley
Date: 04-03-2016
DOI: 10.1002/ECE3.2027
Fish attraction to artificial reefs not always harmful: a simulation study
Publisher: Wiley
Date: 30-09-2015
DOI: 10.1002/ECE3.1730
Reduced exploitation is associated with an altered sex ratio and larger length at maturity in southwest Pacific (east Australian) Pomatomus saltatrix
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.MARENVRES.2019.02.012
Abstract: Pomatomus saltatrix is an important recreational fishing species with seven major populations worldwide. The reproductive biology of the southwest Pacific Ocean (east Australian) population is uncertain, with both an extended spawning and multiple spawning periods previously hypothesised. Here we demonstrate an altered sex ratio biased towards females and a larger length at 50% maturity (L
An ecological halo surrounding a large offshore artificial reef: Sediments, infauna, and fish foraging
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.MARENVRES.2018.07.011
Abstract: Artificial reefs are deployed in coastal systems to meet a range of social objectives and infrastructure requirements, such as recreational ing and fisheries enhancement. Such reefs are typically deployed on soft sediments and yet we know little of their effect on the biophysical characteristics of the surrounding benthos. This study investigated the composition of benthic infauna, sediment characteristics, and demersal fish foraging activity surrounding a large, steel, designed offshore artificial reef (OAR), measuring 12 m × 16 m x 12 m (height x length x width) and weighing approximately 42 tonnes. Using a gradient approach we established four transects with sediment s ling sites located 15, 30, 60, 120 and 240 m from the OAR. Taxon richness of infauna was lower close to the OAR (15, 30 m), and abundances of total infauna elevated at 15 m, driven largely by two families of polychaete (Onuphidae and Spionidae). Sediment characteristics (grain size, total organic carbon, metals) did not vary with distance from the OAR. Using unbaited videos we established that fish foraging activity on the soft sediments was enhanced close to the OAR (15 m), with a 5-10 fold increase in total foraging time that was largely accounted for by the activity of four benthivorous fish species (blue morwong Nemadactylus douglasii, the silver trevally Pseudocaranx georgianus, and goatfishes Upeneichthys vlamingii and U. lineatus). Fish foraging may cause changes in the composition of benthic infauna due to disturbance and selective predation. The effective benthic 'ecological halo' or 'footprint' of the OAR was 15 times the area of the actual reef. We demonstrate that a single large OAR can influence the surrounding benthic invertebrate and vertebrate communities, but that the effects are highly localised.
Latitudinal patterns in trophic structure of temperate reef‐associated fishes and predicted consequences of climate change
Publisher: Wiley
Date: 21-07-2020
DOI: 10.1111/FAF.12488
Relationship between otolith chemistry and age in a widespread pelagic teleost Arripis trutta: influence of adult movements on stock structure and implications for management
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/MF14247
Abstract: This study investigated how the stock structure of Arripis trutta is influenced by the movement of adult fish. Five-year-old fish were s led from four regions in south-east Australia encompassing ~1500km of coastline. Transverse otolith sections were analysed using laser-ablation inductively coupled plasma-mass spectrometry, providing age-related elemental profiles. Multivariate analyses showed that for most age groups, the elemental fingerprint of northern New South Wales (NSW) fish was significantly different from those of the other locations. Northern NSW fish also had a different fingerprint from those of all other locations for the first part of the fish’s life. These results indicate that most A. trutta originate in southern NSW, Victoria and Tasmania and move progressively northward with increasing age. Some recruitment occurs in northern NSW but these fish may not mix with immigrants from further south until they are more than 5 years old. When assessed with the strong latitudinal age gradient of the population, these data are consistent with a single, panmictic stock. The data also highlight the utility of otolith transect analysis in understanding the influence of age-related movements on stock structure and appropriate spatial management of exploited fish species.
To fit or not to fit: evaluating stable isotope mixing models using simulated mixing polygons
Publisher: Wiley
Date: 16-04-2013
Pelagic fish assemblages assessed using mid-water baited video: standardising fish counts using bait plume size
Publisher: Inter-Research Science Center
Date: 22-11-2007
DOI: 10.3354/MEPS07193
Assemblages of pelagic thaliaceans in oceanographic features at the tropical-temperate transition zone of a western boundary current
Publisher: Oxford University Press (OUP)
Date: 02-06-2023
Abstract: Mesoscale oceanographic features influence the composition of zooplankton. Cyclonic eddies can promote upwelling and production of gelatinous zooplankton, which play critical roles in ocean biogeochemical cycling. We examined variation in assemblages of thaliaceans (salps, doliolids and pyrosomes) among mesoscale oceanographic features at the tropical-temperate boundary of the East Australian Current (EAC) in Spring 2019 and Autumn 2021. The influence of cyclonic eddies was examined in a large offshore cyclonic eddy in 2019 and a newly formed frontal eddy in 2021. Pyrosomes were most abundant in the offshore EAC jet, and salps and doliolids were most abundant in coastal features, including within eddies that were transported offshore. In 2019, Salpa fusiformis increased 4-fold over 8 days in the large cyclonic eddy, and in 2021, doliolids increased & 50-fold over 2 weeks in a chlorophyll-rich coastal eddy while abundances of other thaliaceans remained unchanged or decreased. Correlations between abundances of thaliaceans and chlorophyll-a concentrations across the 102 s les collected during both voyages revealed that doliolids occupy a wider range of chlorophyll-a concentrations than salps. Our observations indicate that doliolids thrive in productive shelf environments, salps occur in less productive shelf waters and pyrosomes are most abundant in oligotrophic waters of the south Coral Sea.
Evaluation and correction of subresolved particles by the optical plankton counter in three Australian estuaries with pristine to highly modified catchments
Publisher: American Geophysical Union (AGU)
Date: 28-03-2006
DOI: 10.1029/2005JC002920
Day and night ichthyoplankton assemblages and zooplankton biomass size spectrum in a deep ocean island wake
Publisher: Inter-Research Science Center
Date: 20-09-2006
DOI: 10.3354/MEPS322225
Modeling What We Sample and Sampling What We Model: Challenges for Zooplankton Model Assessment
Publisher: Frontiers Media SA
Date: 22-03-2017
Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient
Publisher: Oxford University Press (OUP)
Date: 30-06-2019
Abstract: The range expansion of tropical fish into temperate waters is increasing markedly in response to climate change. Range-expanding fish encounter novel diets and environments, but we know little about how these conditions facilitate or hinder distribution shifts. Here, we quantified relative growth rate, morphometric condition and trophic niche of juvenile Acanthurus triostegus, a dominant range-expanding tropical surgeonfish, at four locations across 10° of latitude off eastern Australia. We related these metrics to differences in temperature and nutritional quality of dominant seaweeds and the epilithic algal matrix. Temperate food sources were richer in nitrogen than tropical diets. Stable isotope analysis (δ13 carbon and δ15 nitrogen) of fish muscle revealed a large trophic niche breadth at the highest latitude indicating a generalist foraging strategy, and more nitrogen-enriched isotopic signatures compared to tropical regions. Fish length was strongly correlated to δ13C in all regions, suggesting an ontogenetic shift in diet independent of latitude. Despite temperature differences of 4°C, fish growth and body condition were similar across tropical and temperate regions. These results suggest that more nutritious temperate diets may compensate for the effects of cooler water temperatures. Neither summer water temperatures nor dietary factors appear to limit the success of juvenile tropical vagrants as they continue to expand their range along eastern Australia.
Beyond hydrography: daily ichthyoplankton variability and short term oceanographic events on the Sydney continental shelf
Publisher: Elsevier BV
Date: 10-1997
Effects of flood and drought events on multi-species, multi-method estuarine and coastal fisheries in eastern Australia
Publisher: Wiley
Date: 02-11-2012
Pelagic citizen science data reveal declines of seabirds off south-eastern Australia
Publisher: Elsevier BV
Date: 07-2019
Enhanced feeding by pelagic juvenile myctophid fishes within a region of island-induced flow disturbance in the Coral Sea
Publisher: Inter-Research Science Center
Date: 2000
DOI: 10.3354/MEPS203263
Latitudinal and ontogenetic variation in the diet of a pelagic mesopredator (Pomatomus saltatrix), assessed with a classification tree analysis
Publisher: Springer Science and Business Media LLC
Date: 15-03-2017
Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries
Publisher: Cold Spring Harbor Laboratory
Date: 26-06-2020
DOI: 10.1101/2020.06.24.170068
Abstract: Coastal winds transport water masses and larval fish onshore or offshore which may influence estuarine recruitment, yet our understanding of the mechanism underlying this relationship is limited. Here, we combine datasets from a historical database of larval fish off southeast Australia with a high-resolution atmospheric reanalysis model to show that normalised abundance of coastally spawned larvae increased with weak to moderate upwelling favourable winds 14 days prior to s ling. The increase in abundance may reflect increased nutrient and plankton availability for larval fish. Normalised larval abundance decreased following strong upwelling favourable winds but increased after onshore (downwelling favourable) winds, due to wind-driven transport. By combining a commercial estuarine fisheries catch-rate dataset (4 species, 8 estuaries, 10 years) and the high-resolution atmospheric reanalysis model, we show that negative effects of upwelling favourable winds during the spawning period can be detected in lagged estuarine commercial fisheries catch rates (lagged by 2 – 8 years depending on species’ growth rates), potentially representing the same mechanism proposed for larval fish. Upwelling favourable winds in the southeast Australian region have increased since 1850 while onshore winds have decreased, which may reduce larval recruitment to estuaries. Coastal winds are likely an important factor for estuarine recruitment in the southeast Australian region and future research on the estuarine recruitment of fish should incorporate coastal winds.
Dispersal and growth of pelagic juvenile Arcto—Norwegian cod (Gadus morhua), inferred from otolith microstructure and water temperature
Publisher: Oxford University Press (OUP)
Date: 08-1993
A size-resolved pelagic ecosystem model
Publisher: Elsevier BV
Date: 05-2007
Relative impact of seasonal and oceanographic drivers on surface chlorophyll a along a Western Boundary Current
Publisher: Elsevier BV
Date: 2014
Role of the midnight sun: comparative growth of pelagic juvenile cod (Gadus morhua) from the Arcto-Norwegian and a Nova Scotian stock
Publisher: Oxford University Press (OUP)
Date: 10-1996
The effect of parasitism by a blood-feeding isopod on the otolith chemistry of host fish
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/MF12123
Abstract: Otolith chemistry is widely used to discriminate fish stocks or populations, although many of the factors that determine trace-element concentrations within the otolith remain poorly understood. We investigated the effect of a blood-feeding isopod ectoparasite, Ceratothoa sp., on the otolith chemistry of yellowtail scad, Trachurus novaezelandiae. We s led 65 fish from three subpopulations of T. novaezelandiae from Jervis Bay in south-eastern Australia, and used laser ablation (LA)–inductivelycoupled plasma mass spectrometry (ICPMS) to measure otolith lithium (Li) : calcium (Ca), magnesium (Mg) : Ca, strontium (Sr) : Ca and barium (Ba) : Ca from four consecutive summer and winter growth bands. Otoliths of parasitised fish were characterised by significantly lower Li : Ca and Mg : Ca, and higher Sr : Ca, than those of unparasitised in iduals from the same subpopulation. The consistency of trends in otolith chemistry across ablation points and among subpopulations suggests that there is a consistent physiological mechanism through which Ceratothoa parasites affect the otolith chemistry of infected in iduals. It is likely that a range of physical, metabolic, chemical and behavioural processes act in concert to influence the otolith chemistry of parasitised fish. Given the ubiquitous distribution of parasites in the marine environment, differential rates of parasitism among fish stocks, populations or migratory contingents may be an important but unappreciated factor driving stock- or population-based differences in otolith chemistry.
Growth variability and stable isotope composition of two larval carangid fishes in the East Australian Current: The role of upwelling in the separation zone
Publisher: Elsevier BV
Date: 03-2011
The influence of upwelling, coastal currents and water temperature on the distribution of the red tide dinoflagellate, Noctiluca scintillans, along the east coast of Australia
Publisher: Springer Science and Business Media LLC
Date: 27-09-2008
Biological properties across the Tasman Front off southeast Australia
Publisher: Elsevier BV
Date: 11-2008
Modelling the oceanic habitats of two pelagic species using recreational fisheries data
Publisher: Wiley
Date: 09-2015
DOI: 10.1111/FOG.12122
Tests of larval retention in a tidally energetic environment reveal the complexity of the spatial structure in herring populations
Publisher: Wiley
Date: 28-10-2015
DOI: 10.1111/FOG.12129
A novel approach for estimating growth and mortality of fish larvae
Publisher: Oxford University Press (OUP)
Date: 04-09-2021
Abstract: Accurate estimates of growth and mortality are needed to understand drivers of production and cohort success. Existing methods for estimating mortality rates, such as catch-curves, require large s le sizes, as they work by grouping in iduals into age-bins to determine a frequency distribution. Yet, s ling enough larvae is often not possible at fine scales within the constraints of research projects, due to low density of larvae in pelagic environments. Here, we develop a novel method to simultaneously estimate growth and mortality rates of fish larvae as a continuous function of size using theory of size-structured populations, eliminating the need to group data into age-bins. We compare the effectiveness of our model to existing methods by generating data from a known distribution. This comparison demonstrates that while all models recover correct parameter values under ideal circumstances, our new method performs better than existing methods when s le sizes are low. Additionally, our method can accommodate non-linear growth and mortality functions, while also allowing growth and mortality to vary as functions of environmental co-variates. This increased accuracy and flexibility of our method should improve our ability to relate variability in larval production to environmental fluctuations at finer spatial scales.
Temporal abundance patterns of the red tide dinoflagellate Noctiluca scintillans along the southeast coast of Australia
Publisher: Inter-Research Science Center
Date: 2002
DOI: 10.3354/MEPS236075
Erratum
Publisher: Oxford University Press (OUP)
Date: 02-2001
Growth and viability of hatchery-reared Argyrosomus japonicus released into open and semi-closed systems
Publisher: Wiley
Date: 12-11-2009
The ecology of Lepas-based biofouling communities on moored and drifting objects, with applications for marine forensic science
Publisher: Springer Science and Business Media LLC
Date: 27-01-2021
Tethering induces increased stress artifacts in social fish species
Publisher: Wiley
Date: 27-04-2009
DOI: 10.1111/J.1095-8649.2009.02218.X
Abstract: Behaviour of juvenile mulloway Argyrosomus japonicus were investigated under laboratory conditions to determine the efficacy of estimating predation mortality using tethering. The occurrence and duration of stressed behaviour was evaluated for in idual A. japonicus that were hooked but untethered, hooked and tethered and unhooked and untethered (free swimming), both in schools and in isolation. Tethered and hooked treatments showed a significantly higher incidence and duration of stressed behaviour over controls, but stressed behaviour was lower for hooked but untethered fish in the presence of a school. Artifacts associated with elevated stress may reduce the reliability of estimates of relative predation derived from tethering data for schooling fishes.
Carbon and nitrogen stable isotope analysis indicates freshwater shrimp Paratya australiensis Kemp, 1917 (Atyidae) assimilate cyanobacterial accumulations
Publisher: Springer Science and Business Media LLC
Date: 06-06-2008
Functional Morphology of Mouthparts and Gastric Mill of Ibacus Peronii (Leach) (Palinura: Scyllaridae)
Publisher: CSIRO Publishing
Date: 1981
DOI: 10.1071/MF9810931
Abstract: I. Peronii is a scavenger on small benthic invertebrates and animal remains. The mouthparts are less complex than those of some palinurans, as shown by their simple setation and fusion of endites, but have a broad endopod on the third maxillipeds. In the maceration and ingestion of soft animal remains, the mouthparts function as in other palinurans. How the mouthparts collect small prey is not yet known. The proventriculus of I. Peronii is simplified in the number, size and structure of its ossicles as compared with Jasus novaehollandiae and J. lalandei. The action of the gastric mill in I. Peronii is described. The relation between mouthpart structure, proventriculus structure and diet is discussed for I. Peronii and other palinurans. I. Peronii is specialized by simplification of the masticatory structures in relation to the soft and small animal food available at the surface of sublittoral sands and muds.
Comparison of lipid, otolith and morphometric condition indices of pelagic juvenile cod Gadus morhua from the Canadian Atlantic
Publisher: Inter-Research Science Center
Date: 1992
DOI: 10.3354/MEPS084031
Comparative persistence of marine fish larvae from pelagic versus demersal eggs off southwestern Nova Scotia, Canada
Publisher: Springer Science and Business Media LLC
Date: 06-1991
DOI: 10.1007/BF01344331
Reproductive biology of female blue swimmer crabs in the temperate estuaries of south-eastern Australia
Publisher: CSIRO Publishing
Date: 02-12-2021
DOI: 10.1071/MF21191
Abstract: The blue swimmer crab (BSC, Portunus armatus) is an economically and culturally important species distributed throughout the coastal waters of the Indo-Pacific region. Reproduction of BSC is poorly understood in south-eastern Australia, a region that is experiencing substantial tropicalisation from global warming. We examined gonadal development, egg–mass relationships, and the influence of temperature on gonadal development and egg production within five different estuaries spanning ~2.5° of latitude. A negative correlation between the gonadosomatic index (GSI, an index of gonadal development and reproductive investment) and hepatosomatic index (HSI, an index of energy storage) was observed in only the final stages of ovarian development. The weight of the egg mass increased logarithmically with body mass, accounting for up to 55% of total body mass, which was significantly larger than observed in other studies. Thermal performance curves showed a peak in in idual reproductive output at a mean monthly temperature of ~24°C, at which the in idual egg mass weight reached a maximum and the HSI reached a minimum. Environmentally driven variation in BSC reproduction has implications for population productivity and inter-annual variation in recruitment.
Spatial and ontogenetic variation in the diet of wild and stocked mulloway (Argyrosomus japonicus, sciaenidae) in Australian estuaries
Publisher: Springer Science and Business Media LLC
Date: 10-2006
DOI: 10.1007/BF02786529
Using integrative taxonomy to distinguish cryptic halfbeak species and interpret distribution patterns, fisheries landings, and speciation
Publisher: CSIRO Publishing
Date: 06-01-2023
DOI: 10.1071/MF22048
Abstract: Context Species classification disputes can be resolved using integrative taxonomy, which involves the use of both phenotypic and genetic information to determine species boundaries. Aims Our aim was to clarify species boundaries of two commercially important cryptic species of halfbeak (Hemir hidae), whose distributions overlap in south-eastern Australia, and assist fisheries management. Methods We applied an integrative taxonomic approach to clarify species boundaries and assist fisheries management. Key results Mitochondrial DNA and morphological data exhibited significant differences between the two species. The low level of mitochondrial DNA ergence, coupled with the lack of difference in the nuclear DNA, suggests that these species erged relatively recently (c. 500 000 years ago) when compared with other species within the Hyporh hus genus ( .4 million years ago). Genetic differences between the species were accompanied by differences in modal gill raker counts, mean upper-jaw and preorbital length, and otolith shape. Conclusions On the basis of these genetic and morphological differences, as well as the lack of morphological intergradation between species along the overlapping boundaries of their geographical distributions, we propose that Hyporh hus australis and Hyporh hus melanochir remain valid species. Implications This study has illustrated the need for an integrative taxonomic approach when assessing species boundaries and has provided a methodological framework for studying other cryptic fish species in a management context.
Analysis of southeast Australian zooplankton observations of 1938-42 using synoptic oceanographic conditions
Publisher: Elsevier BV
Date: 03-2011
Foraging intensity of wild mulloway Argyrosomus japonicus decreases with increasing anthropogenic disturbance
Publisher: Springer Science and Business Media LLC
Date: 25-12-2015
A tale of two eddies: The biophysical characteristics of two contrasting cyclonic eddies in the East Australian Current System
Publisher: American Geophysical Union (AGU)
Date: 03-2017
DOI: 10.1002/2016JC012241
Salp-falls in the Tasman Sea: a major food input to deep-sea benthos
Publisher: Inter-Research Science Center
Date: 02-10-2013
DOI: 10.3354/MEPS10450
Displacement of diverse ichthyoplankton assemblages by a coastal upwelling event on the Sydney shelf
Publisher: Inter-Research Science Center
Date: 1999
DOI: 10.3354/MEPS176049
Spatial variation in hatch date distributions and origin of pelagic juvenile cod in Icelandic waters
Publisher: Oxford University Press (OUP)
Date: 08-2000
The Socio-ecological System of Urban Fisheries in Estuaries
Publisher: Springer Science and Business Media LLC
Date: 03-2021
Cyclonic entrainment? The ichthyoplankton attributes of three major water mass types generated by the separation of the East Australian Current
Publisher: Oxford University Press (OUP)
Date: 16-04-2014
Abstract: The relationship between larval fish assemblages and coastal oceanography is the basis for much of our understanding of connectivity and productivity of fish populations. Larval fish assemblages were s led from the upper mixed layer ( m depth) at three prominent circulation features [separation of the East Australian Current (EAC), anticyclonic eddy, and cyclonic eddy] off the southeast Australian coast across three bathymetric zones (shelf, slope and ocean) for each feature. The separation of the EAC from the coast at ∼32°S was characterized by warmer, less saline water compared with the cyclonic and anticyclonic eddies further to the south (∼34 and ∼35°S, respectively), which were both characterized by cooler Tasman Sea water and greater fluorescence. The anticyclonic eddy had separated from the EAC three months prior to s ling, which facilitated the movement of a cyclonic eddy from the Tasman Sea westwards to the shelf at ∼34°S. The larval assemblage in the EAC had high numbers of fish of the families Labridae and Stomiidae. The cyclonic eddy was characterized by larval clupeids, carangids, scombrids and bothids, indicating recent entrainment of shelf waters and proximity to major spawning regions. In contrast, the anticyclonic eddy had fewer larval fish, with little evidence for entrainment of shelf assemblages into the near-surface waters. Myctophids were found in high abundance across all oceanographic features and bathymetric zones. The evidence of selective entrainment of coastal larval fish into the near-surface waters of a cyclonic eddy compared with a similar anticyclonic eddy indicates a potential offshore nursery ground.
Modelling the possible effects of climate change on an Australian multi-fleet prawn fishery
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/MF07110
Abstract: The relationship between fisheries and climate has been given renewed emphasis owing to increasing concern regarding anthropogenically induced climate change. This relationship is particularly important for estuarine fisheries, where there are documented correlations between river discharge and productivity. The commercial catch of school prawns (Metapenaeus macleayi) has been shown to be positively correlated with the rates of river discharge in northern New South Wales, Australia. In the present study, a simulation model was developed to analyse the dynamics of the stock for 10 years under alternative river discharge scenarios, and the effectiveness of a series of management strategies under these scenarios was examined. A size-based metapopulation model was developed that incorporated the dynamics of school prawn populations in three habitats being harvested by three different fishing methods. The model indicated that both the growth and movement of prawns were affected by the rates of river discharge, and that higher rates of river discharge usually generated increased commercial catches, but this outcome was not certain. It was concluded that the population does not appear to be overexploited and that none of the three alternative management strategies performed better within the model than the current spatio-temporal closures, even under a wide range of river discharge scenarios.
The Race for Space: Using Acoustic Telemetry to Understand Density-Dependent Emigration and Habitat Selection in a Released Predatory Fish
Publisher: Informa UK Limited
Date: 02-10-2013
Short term variability in larval fish assemblages of the Sydney shelf:tracers of hydrographic variability
Publisher: Inter-Research Science Center
Date: 1999
DOI: 10.3354/MEPS178001
Cyclonic entrainment of preconditioned shelf waters into a frontal eddy
Publisher: American Geophysical Union (AGU)
Date: 02-2015
DOI: 10.1002/2014JC010301
Entrainment and advection in an island's tidal wake, as revealed by light attenuance, zooplankton, and ichthyoplankton
Publisher: Wiley
Date: 2004
Sexual dimorphism in the red morwong, cheilodactylus fuscus
Publisher: CSIRO Publishing
Date: 1994
DOI: 10.1071/MF9941173
Abstract: The red morwong, Cheilodactylus fuscus Castelnau (Pisces : Cheilodactylidae), is a conspicuous fish on the rocky reefs of the eastern Australian coast. Visual determination of the sex of in iduals in the field is necessary to remove sex bias in home-range and associated bioaccumulation studies. A s le of 61 fish (30-50 cm fork length) was collected from spear-fishing competitions in the Sydney area, and from each fish 16 morphometric measurements were taken. A multivariate analysis revealed that, in comparison with females, males are generally larger, with a significantly larger orbit-tubercle - or horn - situated in front of each eye, a smaller eye diameter and a smaller head length. A discriminant function analysis derived from these four features correctly identified 87% of an independent s le of 40 fish. Visual appraisal of fish on the basis of the proportional length of the horns misidentified % of fish cm and % of fish 20-30 cm fork length. The orbit-tubercle in males is between 2% and 4% of the fork length and is composed of bone. According to this simplified visual technique, red morwong aggregations in the Sydney region have consistently biased sex ratios.
Influence of latitudinal variation in environmental gradients and population structure on the demography of a widespread pelagic fish, Arripis trutta (Forster, 1801)
Publisher: Springer Science and Business Media LLC
Date: 09-12-2016
Zooplanktivory is a key process for fish production on a coastal artificial reef
Publisher: Inter-Research Science Center
Date: 15-12-2015
DOI: 10.3354/MEPS11529
Functional morphology of the mouthparts and gastric mill in penaeus plebejus hess (Decapoda: Penaeidea)
Publisher: CSIRO Publishing
Date: 1984
DOI: 10.1071/MF9840785
Abstract: P. plebejus is both a macrophage and a detritivore. Mouthpart structure of adult P. plebejus is similar to that of other macrophagous decapods, but the proventriculus is less calcified than in reptant decapods and the triturative surfaces of the gastric mill are small. These features have led previous authors to postulate that maceration of large food by penaeids occurs mainly at the mouthparts. In P. plebejus, the mouthparts function as in macrophagous reptant decapods, the food being torn between the mandibles and third maxillipeds and swallowed with little maceration. The proventriculus exhibits a rhythmic macerating action in which shell fragments and sand ingested with the diet play a part. The proventriculus of P. plebejus is functionally analogous to a gizzard.
Multiple spawning events promote increased larval dispersal of a predatory fish in a western boundary current
Publisher: Wiley
Date: 28-04-2020
DOI: 10.1111/FOG.12473
A global review of pyrosomes: Shedding light on the ocean's elusive gelatinous “fire‐bodies”
Publisher: Wiley
Date: 18-08-2023
DOI: 10.1002/LOL2.10350
Abstract: Pyrosomes are colonial tunicates that form gelatinous tubes and occasionally produce bioluminescent swarms. The rapid “bloom‐bust” dynamics of pyrosomes have the potential to outcompete other zooplankton, restructure marine food webs, enhance carbon export, and interfere with human activities. Pyrosomes have been recorded for at least two centuries, yet much remains unknown about their physiology, bloom mechanisms, and ecosystem impacts. Recent bloom reports prompt the question of whether frequencies or densities are increasing, and whether potential population changes are caused by ocean change. This review clarifies current information on pyrosome biology and ecology and explores apparent contradictions in habitat preferences and diel vertical migration (DVM). We posit that the dominant species, Pyrosoma atlanticum , may preferentially inhabit waters below 18°C and alter its DVM activity to maintain overall body temperature near this threshold. Expanding our knowledge of pyrosomes is needed to facilitate their inclusion in ecosystem models and forecasts of future population distributions.
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