Effect of Age and Season Limits for Maximum Sustainable Fisheries in Age-structured Model

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  • Takenaka Yasuto
    Department of Biology, Faculty of Science, Kyushu University Ocean Research Institute, University of Tokyo
  • Matsuda Hiroyuki
    Department of Biology, Faculty of Science, Kyushu University Ocean Research Institute, University of Tokyo

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  • Effect of Age and Season Limits for Max

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We consider the optimal harvesting policy, that is maximizing the yield, under sustainable fisheries including the age of first capture and seasonal harvesting. To obtain this policy, we analyze mathematical and numerical methods using spawning per recruit (SPR) and yield per recruit(YPR) simultaneously. We use data on a chub mackerel population in the Pacific Ocean off eastern Japan. We consider three cases of seasonal fishing, fishing throughout the year, half year after the spawning season and variable fishing season, defined as the policy that varies the beginning and the end of fishing season. Under a variable fishing season, the optimal fishing season includes the fishing season of the two major types of chub mackerel Scomber japonicus fisheries, the dip-net and the purse-seine fisheries. We conclude that (1) the maximum sustainable yield is unlikely to be in pulse fishing, (2) The optimal yield under a fixed fishing season policy is close to that under a variable fishing season, (3) In any case, the fish should be preserved until the end of the first spawning season.

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