ORCID Profile
0000-0002-8156-9666
Current Organisation
Yayasan Impak Laut Biru (IMPACT Blue Sea Foundation)
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Publisher: IOP Publishing
Date: 2019
DOI: 10.1088/1755-1315/404/1/012080
Abstract: Tonic immobility is an induce method to achieve a temporary condition of cataleptic-like, which is a sudden loss of muscle tone, as a result of various procedures such as situate the object in an “unnatural” position or situation. This method has been widely applied on elasmobranch species, except for species of Hemiscyllidae. This study was intended to assess the application of tonic immobility on Hemiscyllium halmahera - an endemic shark to Halmahera Islands, Indonesia. Our study has shown that the average induction time ranged from 11.49 to 40.12 seconds, while the hypnosis duration ranged from 6.51 to 28.36 seconds. Based on our results, tonic immobility can be applied as non-lethal method to Hemiscyllium halmahera during capture and physical examination such as morphometric and weight measurement. However, we suggested to investigate further physiology examination such as heart rate, and breathing frequency. during tonic immobility phase on Halmahera walking shark or other reef shark species.
Publisher: Frontiers Media SA
Date: 28-04-2020
Publisher: Elsevier BV
Date: 09-2022
Publisher: IOP Publishing
Date: 10-2017
Publisher: Wiley
Date: 03-03-2023
DOI: 10.1111/ACV.12859
Publisher: MDPI AG
Date: 30-05-2022
DOI: 10.20944/PREPRINTS202205.0397.V1
Abstract: Tawny nurse shark (Nebrius ferrugineus) is a species of carpet shark distributed across the tropical Indo-Pacific region. Tawny nurse shark is listed as & Vulnerable& on IUCN Redlist and rarely seen, recorded and studied in Indonesia. We recorded this species during SCUBA ing activity in Morotai waters in April 2022. Scientific record of the species is highly important for conservation and habitat management, particularly in Morotai, a region in North Maluku famous for shark-based marine tourism.
Publisher: IOP Publishing
Date: 05-2019
DOI: 10.1088/1755-1315/278/1/012071
Abstract: The elevated extinction risk of elasmobranchs is proportional with the increase of fishing mortality due to overfishing. Indonesia is the biggest shark fishing country in the world, with Tanjung Luar as a fishing village specifically targeting sharks. More than 30 species of sharks and rays that have been landed in Tanjung Luar recently received increased conservation status under the International Union for Conservation of Nature (IUCN). This research aimed to analyze the catch abundance of vulnerable or endangered elasmobranchs in Tanjung Luar and identify the fishing seasons. Four years of landing monitoring data from 2014-2017 were analyzed the fishing seasons and fisheries pattern of vulnerable or endangered elasmobranchs species in Tanjung Luar, calculated Catch per Unit Effort (CPUE) based on fishing power index and also fishing season index. The CPUE of sharks and rays from 2014 to 2017 fluctuated but was not significantly different. We found that shark fishing season occurred in six months and ray fishing season occurred only in four months. The results suggested that management measures should focus on gear control and spatio-temporal closures which could have significant benefits for the conservation of elasmobranch species, and may help to improve the overall sustainability of the fishery.
Publisher: Elsevier BV
Date: 12-2021
Publisher: IOP Publishing
Date: 05-2019
DOI: 10.1088/1755-1315/278/1/012043
Abstract: Sharks and rays are vulnerable species, which are highly exploited in Indonesian waters but lacked of detailed information on their ecology and fisheries status. This research aims to assess the level of vulnerability of sharks and rays to overfishing using the maximum intrinsic rate of population increase (r max ), derived from the Euler-Lotka equation, as a proxy of extinction risk. It is calculated based on several biological parameters including fecundity, maximum age, age at maturity, and the number of offspring. Using rmax calculation adapted to shark and ray life history traits by accounting for survival to maturity, we were able to calculate rmax values for 26 out of 208 sharks and rays species present in Indonesia. This includes vulnerable species such as Mobula alfredi, Prionace glauca , and Pristis zijsron. This result showed that r max is a valuable tool which can be used to quantify extinction risk with some level of precision, but it also highlights the necessity to collect important biological information of the most vulnerable species to further estimate their status. This approach requires complementary information related to external threats such as habitat degradation, species economic value and threat level from local fishing effort and related fishing gears.
Publisher: Universitas Airlangga
Date: 30-09-2020
DOI: 10.20473/JIPK.V12I2.21486
Abstract: HighlightUtilization, Growth, and Population of Bullet Tuna (Auxis rochei Risso 1810) in Indian Ocean Southern Sumbawa (2020)Eligibility Status Kawakawa (Euthynnus affinis Cantor, 1849) from Lombok Strait and Indian Ocean Southern Sumbawa (2020)Biological Aspect of Parent Candidate of White-spotted Rabbitfish (Siganus canaliculatus) from Serewe Bay, Lombok Timur District (2020)Study of Sustainability in Management of Malabar Blood Snapper Fisheries in the Indian Ocean Coastal Waters, Sumbawa Regency (2020)Growth Rate and Survivorship of Acropora sp. Fragments that Transplanted on the Artificial Substrate Made from Fly Ash and Bottom Ash (2020)Reproductive Biological Aspect of Panulirus penicillatus in Sumbawa Island Waters, Indonesia (2019)Fisheries Resource Status of Spiny Lobster Panulirus penicillatus in Labangka Waters, South Sumbawa, Indonesia (2019)Growth Rate of Acropora formosa Coral Fragments Transplanted on Different Composition of Faba Kerbstone Artificial Reef (2019)Agribusiness of Edible Jellyfish Crambione mastigophora in Saleh Bay, NTB: Implementation of Sustainable Fisheries (2019)AbstractThe Labangka tidal waters, located south of Sumbawa Regency are the habitat and potential fishing ground for lobsters. The dominant species caught by the Labangka fishermen are the Panulirus penicillatus and P. homarus. Fishing pressure is one of the greatest factor influencing the biological and stock condition of lobsters in Labangka. The aim of this study is to determine the key attributes in growth and population parameters. Some attributes whose values are relatively stable compared to that of 2015, consist of conditional factors such as (old age), growth pattern (hypoallometric), growth coefficient (slow growth), exploitation rate (overexploited), and fishing rate (excessive fishing). While, attributes that have improved are carapace length at first capture (CLc) longer than 50% carapace length of infinity (0.5CL∞) and CL rate (CLc/0.5CL∞) reaching more than 1.00 (CLR 1.00). In implementing sustainable management of spiny lobster for fishery resources, improvisation is needed in place of catching technologies. One of the recommendation is to add more fishing vessel (Lboat 17.0 m) equipped with engines that are able to reach potential fishing ground in the west waters of Cemplung beach, Labangka.
Publisher: MDPI AG
Date: 18-07-2018
Abstract: The silky shark (Carcharhinus falciformis) is the most common shark landed in Indonesian waters, including in the Indian Ocean. However, even though they are frequently caught, there is a lack of information on the population and abundance of silky sharks in the Indian Ocean. Cilacap and Tanjung Luar are two of Indonesia’s shark fishery hotspots, both located on the edge of the Indian Ocean, which is a part of the Indonesian Fisheries Management Area (FMA) 573. The fishers from both places usually have fishing grounds in that particular fisheries management area. This research aims to update the abundance, and to investigate the factors, which influence catches of silky shark in the FMA 573 based on monthly enumeration during 2015–2016. This study found that standardized catch-per-unit-effort (CPUE) or abundance indices of silky shark in the Indonesian FMA 573 increased from 2015 to 2016. We suggested that fish immigration and decreasing fishing pressure may affect the fish abundance. Fisheries management is required to regulate the fishing pressure, such as controlling the number of boats/licenses and the number of trips or fishing gear, as well as initializing spatial and temporal fishing closure.
Publisher: IOP Publishing
Date: 2020
DOI: 10.1088/1755-1315/420/1/012013
Abstract: Thresher sharks (family Alopiidae) are an evolutionarily distinct and globally endangered species group. Indonesia is the world’s largest shark fishing nation, and a global priority for reducing the capture of threatened shark species. Kutaradja port is one of Indonesia’s largest fishing ports, located in the capital of Aceh Province, Banda Aceh, Western Indonesia. Kutaradja is a large oceanic port serving a variety of fisheries, from small scale to industrial fleets. One of the main fisheries operating from Kutaradja port is an industrial purse seine fleet targeting valuable pelagic fish, particularly tuna. Pelagic sharks such as threshers are vulnerable to capture in these fisheries, due to their co-occurrence with stocks of valuable pelagic species. Here we describe the volume and composition of shark catch in Kutaradja’s purse seine fleet, based on daily landing monitoring conducted in January 2017 to May 2019. Our results show that the dominant species caught are thresher sharks (Alopiidae), which make up 51% of all shark landings. A total of 627 thresher sharks were landed during the monitoring period, consisting of 558 in iduals of pelagic threshers shark (Alopias pelagicus) and 69 in iduals of bigeye thresher shark (Alopias superciliosus). The catch is dominated by mature females, which could be particularly detrimental to the reproductive capacity of the population. Fishers in purse seine vessels often catch these threshers with hand-lines, which are used as a secondary gear while the main fishing gear is soaking. Based on these findings, we proposed recommendations for reducing thresher shark fishing mortality, including restricting the use of secondary fishing gears and releasing incidentally captured sharks.
Publisher: California Digital Library (CDL)
Date: 29-06-2022
Publisher: IOP Publishing
Date: 11-2019
DOI: 10.1088/1755-1315/348/1/012013
Abstract: The waters of North Maluku Province are known as a hotspot for sharks in Indonesia. However, despite the richness and importance of shark population in this area, information about shark fisheries and trade remains limited. The aim of this research was to fill this knowledge gap by identifying the characteristics of shark fisheries and trade in this region. We conducted interviews and field observations during August 2017 in two case study regencies: South Halmahera and Morotai. The result show that targeted shark fishing is practiced in Mano village, Gomumu Island, South Halmahera and Posi-posi and Leo-leo Villages of Rao Island, Morotai Island. Mano village’s fishery consists of 48 vessels, with the main fishing grounds in Halmahera and Papua waters. Posi-Posi and Leo-Leo Villages operate a fleet of 12 vessels, within the main fishing ground in northern Morotai waters. We identified two traders of shark products in Morotai Island Regency, and seven traders in South Halmahera Regency. The primary traded commodities are shark fins and meat, predominantly. Fins are transported by boat to traders in Manado, Surabaya, Bau-Bau and Makassar, while meat is sold on to traders in Jakarta. We expect that the results of this research can be used to direct attention and resources towards managing shark fisheries and trade in North Maluku Province in the future.
Publisher: IOP Publishing
Date: 05-2019
DOI: 10.1088/1755-1315/278/1/012038
Abstract: Scalloped hammerhead sharks ( Sphyrna lewini ) are top predators in the marine ecosystem. This species also began to be listed in Appendix II CITES in 2013 and received Indonesia government regulation through banning export. Kutaraja is one of fishing port Banda Aceh, and hammerhead sharks often caught as by-catch from coastal and pelagic fisheries that operate in Indian ocean western part of Aceh. This research aims to determine the size distribution and sex ratio of scalloped hammerhead sharks that landed in Kutaraja fishing port. Data were collected including length distribution and sex composition of captured scalloped hammerhead shark during January-December 2017. Results show that the size distribution of hammerhead sharks are between 62 and 272 cm in Total Length (TL) with an average of 131 cm TL for males and between 58 and 281 cm TL with an average of 128 cm TL for females. There was a positive relationship between the total length and clasper length. The Sex ratio of male and female is 1:1.7. The result of this study hopefully will help management effort for this endangered species, especially in how to reduce the by-catch of female and immature hammerhead sharks that dominate the catch in Banda Aceh fisheries.
Publisher: Public Library of Science (PLoS)
Date: 10-2020
Publisher: IOP Publishing
Date: 05-2019
DOI: 10.1088/1755-1315/278/1/012049
Abstract: Indonesia is the heart of the Coral Triangle–the global epicenter for marine bio ersity, and home to many endemic, threatened and protected species. There is a need for rapid, low-cost methods to better identify and tackle seafood fraud in Indonesia because Indonesia is also the world’s largest shark fishing nation. Levels of domestic consumption of sharks and their relatives are thought to be significant, with different drivers of consumption across different products and geographies, including active and passive consumption, where passive consumers being unaware of the species origin of their seafoods. This study applies a COI DNA barcoding method to identify seafood products sold in local markets, with the aim of better understanding of the species composition about non-fin shark products in the domestic trade, and assessing the reliability of the COI method for seafood forensics. The results showed that all s led seafood products were successfully identified to the species level, with an accuracy of 97-100%. S les varied from different products including satay, salted meat, and meat curry, which are mostly sold in traditional markets. The magnitude, distribution and drivers of domestic consumption of shark product need to be understood in order to guide the design of future conservation.
Publisher: Cold Spring Harbor Laboratory
Date: 10-03-2020
DOI: 10.1101/2020.03.10.985465
Abstract: The scalloped hammerhead shark Sphyrna lewini is an endangered species which expected to population declined worldwide including in Indonesia due to overexploited. However, there is a lack of information regarding recent population structure to promote proper management and conservation status in Indonesia. This study aimed to investigate the genetic ersity, population structure and connectivity of S. lewini population in Indonesia from three major sharks landing sites in Aceh (n= 41), Balikpapan (n= 30), Lombok (n= 29), and additional sequences retrieved from West Papua (n= 14) and Western Indian Ocean population (n= 65). Analyses of mitochondrial CO1 gene successfully identified a total of 179 sequences of S. lewini with an average 594 bp nucleotide with 40 polymorphic loci in 4 haplotypes for Indonesian population and 8 haplotypes for Western Indian Ocean. The overall values of genetic ersity in Indonesia was high (Hd= 0.7171 π= 0.0126), with the highest was in Aceh (Hd= 0.6683 π= 0.0198), and the lowest was in Papua (Hd= 0.1429 π= 0.0005), while in Western Indian Ocean the overall value was fairly low (Hd= 0.2322 π= 0.0010). The AMOVA and F ST revealed three significant population sub isions in Indonesia ( F ST = 0.4415 p 0.001) with separated population for Aceh and West Papua, and a mixing population between Balikpapan and Lombok ( F ST = 0.044 p = 0.089), whereas relatively no significant differentiation within population in Western Indian Ocean ( F ST = −0.0131 p = 0.6011), and significant different level showed by Indonesian population compared with Western Indian Ocean population ( F ST = 0.7403 p 0.001). The construction of haplotype network exhibited evidence of gene flow and haplotype sharing between populations. This result indicated a complex and limited connectivity population of S. lewini in Indonesia, and between Western Indian Ocean in regional scale which need co-management action across region.
Publisher: Center for Open Science
Date: 13-12-2022
Abstract: Many shark species (Class Chondrichthyes) are threatened with extinction due to overfishing. Of the & ,000 described Chondrichthyan species, the pelagic thresher sharks (Alopias pelagicus) are of particular conservation priority since they are evolutionarily distinct and globally endangered. As the world’s largest shark fishing nation, with particularly high catch rates of thresher sharks, the impact of Indonesian fisheries has become a global priority for thresher shark conservation. Therefore, baseline data is needed to inform management and implement international environmental agreements such as the Convention on International Trade of Endangered Species (CITES). This research provides data and management recommendations for small-scale targeted shark fishing in Western Indonesia, where thresher sharks are regularly caught. Yet, fisheries are data-poor, with limited information on catch rates and limited regulation in place. Daily landings data was recorded from June 2019 to December 2020 in two sites in Southwest Aceh, and analysed to explore catch patterns, risk factors for thresher sharks, and potential mitigation options. The results show that 25 wooden vessels of & Gross Tonnage (GT) use bottom longlines to target sharks in the Indian Ocean. A total of 109 pelagic thresher in iduals were recorded during the study period, with a female-skewed sex ratio (1 Female vs 0.39 Male), presumably impacting the population's reproductive potential. Based on this data, we offer some potential management measures to reduce fisheries impacts on pelagic thresher sharks by applying a simple mitigation hierarchy framework. These results offer fisheries management recommendations, including effort limits and gear modifications. Overall, the data we present could contribute to understanding the stock status and exploitation rate of thresher sharks in the Indian Ocean and support CITES implementation in Indonesia. At the same time, the mitigation hierarchy approach and recommendations could be applied to other similar small-scale fisheries in Indonesia and globally
Publisher: IOP Publishing
Date: 04-2018
Publisher: Wiley
Date: 09-03-2023
DOI: 10.1002/PAN3.10463
Abstract: Fisheries bycatch is the greatest threat to migratory, long‐lived marine animals. Addressing bycatch ultimately requires changing fisher behaviour, yet social and behavioural sciences are rarely applied to bycatch mitigation, with an absence of theory‐informed behaviour change interventions. Moreover, mitigating bycatch is particularly challenging in small‐scale mixed‐species fisheries (SSFs), where perceptions of target and non‐target vary widely, and all catches have economic or subsistence value. Such fisheries are ubiquitous throughout the world's oceans, and bycatch mitigation in these contexts necessitates a people‐centred approach. We seek to address this gap, drawing on well‐established theories from behavioural and social sciences. We first typify bycatch as a spectrum rather than a clearly delineated component of catch, where the position of a species on this spectrum depends on fishers' beliefs regarding the outcomes of bycatch‐relevant behaviour. We then outline an approach to ‘diagnose’ fishers' underlying beliefs about bycatch, using the theory of planned behaviour (TPB): a widely applied and empirically tested theory for predicting and changing behaviour. Finally, we illustrate the approach using an empirical case study, exploring fishers' beliefs regarding bycatch‐relevant behaviour for three endangered elasmobranch species in a small‐scale gill net fishery in Indonesia. Our findings show how the TPB can help to understand fishers' underlying beliefs regarding bycatch, and facilitators/inhibitors of bycatch mitigation, to inform behaviour change interventions. We emphasize the need to understand the human dimensions of bycatch, especially in SSFs, where technical fixes alone will be insufficient to change behaviour. Rather, interdisciplinary approaches are needed to align fishers' needs with conservation objectives. Our bycatch spectrum and the TPB could be widely applied for disentangling drivers of bycatch in other SSFs and designing interventions which support more effective and socially just marine conservation. Read the free Plain Language Summary for this article on the Journal blog.
Publisher: Center for Open Science
Date: 15-11-2021
Abstract: Fisheries bycatch is the greatest threat to migratory, long-lived marine animals. Managing bycatch can be particularly problematic in small-scale mixed-species fisheries, where perceptions of target and non-target vary widely, and all catches have economic or subsistence value. Such fisheries are ubiquitous throughout the world’s oceans, and represent a cross-disciplinary challenge for bio ersity, food security and livelihoods. We offer a novel approach for addressing this challenge, drawing on well-established theories from behavioural and social sciences. We first typify bycatch as a spectrum rather than a clearly delineated component of catch, where the position of a species on this spectrum depends on fishers’ beliefs regarding the outcomes of bycatch-relevant behaviour. We then outline an approach to diagnose the underlying socio-psychological drivers of bycatch, based on the Theory of Planned Behaviour. Finally, we illustrate the approach using an empirical case study, exploring fishers’ beliefs regarding bycatch-relevant behaviour for three endangered species in a small-scale gill net fishery in Indonesia. We show how a socio-psychological approach can help to identify conflicts and synergies between bycatch mitigation and fishers’ beliefs, thus informing more effective and socially-just interventions for marine megafauna conservation. We emphasize the need to understand human dimensions of bycatch, especially in SSFs, where technical fixes alone will be insufficient to change behaviour. Rather, interdisciplinary approaches are needed to align fishers’ needs with conservation objectives. Our spectrum and approach could be widely applied for disentangling drivers of bycatch in other SSFs, and designing interventions which support effective and equitable marine conservation.
Location: Indonesia
Location: Indonesia
No related grants have been discovered for Muhammad Ichsan.