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Stepwise function o...
Stepwise function of natural growth for Scylla serrata in East Africa : a valuable tool for assessing growth of mud crabs in aquaculture
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- Moksnes, Per-Olav, 1965 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Mirera, David Oersted (författare)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Kenya Marine & Fisheries Res Inst, Kenya
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- Björkvik, Emma (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Hamad, Muumin Iddi (författare)
- Univ Dar Es Salaam, Tanzania
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- Mahudi, Humphrey Matalu (författare)
- Mafia Isl Marine Pk, Tanzania
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- Nyqvist, Daniel (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Jiddawi, Narriman (författare)
- Univ Dar Es Salaam, Tanzania
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- Troell, Max (författare)
- Stockholms universitet,Stockholm Resilience Centre,The Beijer Institute of Ecological Economics, Sweden,Stockholm University
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(creator_code:org_t)
- 2014-04-12
- 2015
- Engelska.
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Ingår i: Aquaculture Research. - : Hindawi Limited. - 1355-557X .- 1365-2109. ; 46:12, s. 2938-2953
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://gup.ub.gu.se...
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Abstract
Ämnesord
Stäng
- Predicting growth is critical in aquaculture, but models of growth are largely missing for mud crab species. Here, we present the first model of natural growth in juvenile and adult mud crabs Scylla serrata from East Africa using a stepwise growth function based on data on intermoult periods and growth at moult from field mark-recapture, pond and laboratory studies. The results showed a sigmoid growth pattern in carapace width and suggest that S.serrata in East Africa will reach 300g and sexual maturity similar to 9.9months after settlement, and a commercial size of 500g after 12.4months. Analyses of the literature identified several issues with the common praxis to compare standard growth measures between aquaculture studies with different initial size or growing periods. Using the new growth function to estimate the proportional difference between modelled and obtained growth as an alternative method, we show that growth rates of S.serrata cultured in cage systems, which are dominant in East Africa, was <40% of the estimated natural growth and growth obtained in pond systems. The analysis also indicated that growth rates of S.serrata in Southeast Asia was over 50% higher compared with similar culture systems in East Africa, and that different species of mud crabs had large differences in growth rates. This study shows that growth in the present mud crab aquaculture systems in East Africa is below their expected potential. Further work is needed to identify the factors behind this observation.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Fisk- och akvakulturforskning (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Fish and Aquacultural Science (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- mud crab
- moult increment
- intermoult period
- segmented growth
- aquaculture
- Akvatisk ekologi
- Aquatic Ecology
- mud crab;moult increment;intermoult period;segmented growth;aquaculture
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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