Analysing extensive fish culture systems by transparent population modelling: bighead carp, Aristichthys nobilis (Richardson 1845), culture in a Chinese reservoir |
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| Authors: | K Lorenzen G Xu F Cao J Ye T Hu |
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| Institution: | Renewable Resources Assessment Group, Imperial College, University of London, London, UK;Zhejiang Institute of Freshwater Fisheries, Huzhou, Zhejiang Province, China |
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| Abstract: | A transparent population modelling approach is used to analyse a large-scale extensive fish culture system, the bighead carp, Aristichthys nobilis (Richardson 1845), fishery in a Chinese reservoir. The population model incorporates explicit submodels for density-dependent growth and size-dependent mortality, and allows the assessment of stocking density, seed fish size, fishing mortality (fishing effort), and gear selectivity. The process of model building and parameter estimation from stocking and catch data is described in detail. The full analysis is carried out in computer spreadsheets where all model components are visible and can easily be modified to take account of specific conditions, or to explore different assumptions. The practical use of the model in management decision making is discussed, together with data requirements and the possible need for experimental management. |
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