ORCID Profile
0000-0003-2936-0328
Current Organisations
Macquarie University
,
University of the Sunshine Coast
,
University of Sydney
,
James Cook University
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Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 06-2021
Publisher: Wiley
Date: 27-12-2017
DOI: 10.1111/RAQ.12226
Publisher: MDPI AG
Date: 23-02-2022
DOI: 10.3390/MICROORGANISMS10030497
Abstract: We recently demonstrated that dietary supplementation with seaweed leads to dramatic improvements in immune responses in S. fuscescens, a candidate species for aquaculture development in Asia. Here, to assess whether the immunostimulatory effect was facilitated by changes to the gut microbiome, we investigated the effects of those same seaweed species and four commercial feed supplements currently used in aquaculture on the bacterial communities in the hindgut of the fish. Since we found no correlations between the relative abundance of any particular taxa and the fish enhanced innate immune responses, we hypothesised that S. fuscescens might have a core microbiome that is robust to dietary manipulation. Two recently published studies describing the bacteria within the hindgut of S. fuscescens provided an opportunity to test this hypothesis and to compare our s les to those from geographically distinct populations. We found that, although hindgut bacterial communities were clearly and significantly distinguishable between studies and populations, a substantial proportion (55 of 174 taxa) were consistently detected across all populations. Our data suggest that the importance of gut microbiota to animal health and the extent to which they can be influenced by dietary manipulations might be species-specific or related to an animals’ trophic level.
Publisher: MDPI AG
Date: 10-2021
DOI: 10.3390/SU131910946
Abstract: Seaweed farming in Indonesia is carried out throughout much of the archipelago and is mainly undertaken by smallholder farmers. Indonesia is the largest global producer of the red seaweeds Kappaphycus and Eucheuma, which are used to produce carrageenan, and is a major producer of Gracilaria, which is used to produce agar. Seaweed farming is attractive to farmers in rural coastal communities because capital and operating costs are low, farming techniques are not technically demanding, labour requirements are relatively low (allowing farmers to engage in other livelihoods), and production cycles are short (30–45 days), providing regular income. Using reported values for seaweed-farming income, we conclude that seaweed farming can, but does not always, lift rural households above the Indonesian poverty line. In addition to direct financial benefits, seaweed farming also contributes to human and social capital within seaweed farming households and communities. Achieving continued economic and social benefits from seaweed farming will require additional policy development, as well as research and development to support improved and more consistent seaweed productivity and improved product quality at the farm level, provision of effective extension and technical support services, and ersification of the existing value chains in order to reduce the impacts of price fluctuations that are associated with limited global commodity chains.
Publisher: Wiley
Date: 02-01-2020
DOI: 10.1111/RAQ.12598
Abstract: Grouper aquaculture is currently trending towards production of hybrids, due to their improved growth and disease resistance. The predominant cross is between tiger grouper ( Epinephelus fuscoguttatus ) females and giant grouper ( Epinephelus lanceolatus ) males (TGGG). Sustainable TGGG aquaculture development is limited by reliance on wild‐caught ‘trash’ fish as feed rather than commercially formulated feeds. Specific TGGG nutrient requirement values remain limited, especially for larger fish that consume the highest volumes of feed. This limits the effectiveness of formulated feeds to provide optimal growth and feed conversion in an economically efficient manner. This review examines the current knowledge of hybrid grouper nutrient requirements for grow‐out feeds and identifies knowledge gaps to inform further research that will enable development of cost‐effective feeds that optimize fish growth, feed conversion and health. Current best practice in TGGG feeds specifies a relatively high protein requirement (53.5% crude protein), with higher arginine and lower lysine requirements than previously reported for grouper species. Like other groupers, the hybrid appears to require low lipid levels (10–14%) however, it remains to be elucidated whether this increases significantly with body size. The nutrient requirement data within this review provide a starting point for development of specific hybrid grouper feeds. However, commercialization of such feeds requires better understanding of the socio‐economic context of the target industry. While formulated feeds may be more cost‐effective, their implementation is limited by inferior growth compared with ‘trash’ fish. Performance gains are expected through increased understanding of size‐specific nutrient requirements and specific raw material quality criteria.
Publisher: Elsevier BV
Date: 07-2021
No related grants have been discovered for Michael Rimmer.