Abstract

Usually a fish population with a high fecundity has a very variable re-cruitment. For this type of population, it is more realistic to abandon the fiction that there is a well defined stock recruitment relationship. Furthermore, the concept of maximum sustainable yield (MSY) is not applicable to this type of population. A good and realistic management policy is to set the fishing mortality rate approximately equal to the natural mortality rate and impose the optimal size limit for the specified fishing mortality rate. For a species with a low fecundity the stock recruitment relationship is usually well defined. In this case, it is possible to build a realistic model of the dynamics of the population, and the full power of stability theory and optimal control theory may be used to formulate optimal management policies.

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