Abstract
A model is proposed for the analysis of fishing tuna from fish-aggregating devices (FAD), and parameters for the model are estimated. Methods are described for determining the optimum number of FAD's to be deployed and the optimum number of vessels in a fishery. Field measurement of recruitment and loss of fish associated with FAD's is needed for adequate biological or economic analysis of FAD fishing. Results show that if recruitment to FAD's is proportional to the biomass not associated with FAD's, then increasing the number of FAD's beyond some limit will actually decrease total catch. Similar models could be used in any trap fishery, particularly for crabs or lobsters.
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