Abstract
Interactions between inshore and offshore fisheries are studied by mathematical modelling. The results show that various components of a fishery interact closely with each other and managing such fisheries must take into account both specific features of each component and interactions between them. To obtain maximum sustainable yields or net revenues, seasonal closure or exclusion of some components may be necessary. In the case of the hairtail fishery in the East China Sea, operation of both trawl fisheries will reduce the total catch. The maximum sustainable yield and maximum net revenue occurs coincidentally when both trawl fisheries are suspended and the fishing mortality in the inshore seine fishery is controlled at F = 1.02. Banning the inshore trawl fishery can increase the total catch without need to raise the efforts of other two components and benefits the inshore seine fishery most significantly. However, above this the fishery remains under pressure unless other components are controlled. Increasing juvenile catches in the inshore seine fishery will lower the total catch and intensify the effect of the two trawl fisheries.
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