Abstract
In recent years, stocking of natural populations with fish fry, which are produced artificially or transferred from other populations, are performed in order to enhance fishing productivity. Two kinds of resource enhancement effects are expected to result from such artificial stockings: the direct (intragenerational) effect from the recruitment of stocked individuals them-selves and the indirect (intergenerational or reproductive) effect from the increase in the recruitment caused by the reproduction of stocked individuals. In this paper, we obtain the enhancement effect, defined as an increase in the sustainable production, as a function of stocking intensity and fishing mortality, and study its dependency on various biological and economical factors by using simple mathematical models. We also obtain the condition for the profitability of stocking operation and the optimal fishing mortality as a function of stocking intensity.
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