Fisheries Management Under Species Alternation: Case of the Pacific Purse Seiner off Japan Public Deposited

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  • In the northwestern Pacific area, the fish alternation phenomena amongst sardine, anchovy and chub mackerel have been observed in the cycle of about fifty years. The sardine biomass has been drastically increased in 1930s and 1980s. Chub mackerel biomass has in 1970s, and anchovy has in 1960s and 1990s. It has been gradually clear that these phenomena are as a biological response to the atmospheric and oceanographic regime shifts. In order to derive fisheries management theory under these situations, we analyzed the inter-relationships amongst resource dynamics of the species, economic dynamics of purse seine fishery, and fisheries production. We found that the intensive capital investment during the sardineabundant periods (1980s) had became economic burden after sudden declines of sardine in 1990s, and prevent the broom of chub mackerel in 2000s. In order to discuss management options which take species alternation into account, we estimated the effects of hypothetical governmental interventions around the sardine-abundant period (1980s) in terms of fish biomass, economic efficiency, and food supply in the later years.
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  • Makino, Mitsutaku and Takumi Mitani. 2010. Fisheries Management Under Species Alternation: Case of the Pacific Purse Seiner off Japan. 8 pages. In: Proceedings of the Fifteenth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 13-16, 2010, Montpellier, France: Economics of Fish Resources and Aquatic Ecosystems: Balancing Uses, Balancing Costs. Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2010.
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