Lorenzen, Kai (1993) Estimating the potential yield of South Asian small reservoir fisheries : a methodological study. (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 129 pp.

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Abstract

South Asian small reservoir fisheries are culture-based, i.e. reliant on the regular stocking of seed fish. In this study, an analytical model is developed that can be used to estimate the potential yield from such fisheries, and to explore options in their management. Density-dependent growth and size-dependent mortality are the key biological processes in a culture-based fishery. Models for both processes are developed and tested on published data. The cost of seed fish and the selling price of produce from small reservoir fisheries are examined briefly, and are also modelled mathematically. The sub-models for growth, mortality, costs and revenue are combined in a lengthstructured model of a small reservoir fishery. The model is then used to explore the effects of stocking density, size of seed fish, staggered harvesting, and multiple stocking on seasonal reservoir fisheries. The optimal stocking and harvesting of perennial reservoirs is also investigated. Management guidelines are developed. Finally, it is discussed how the model, and the conceptual insights gained from it, can be used in the practical management of culture based reservoir fisheries.

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