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A Management Policy for North Japan Sea Sailfin Sandfish, Arctoscopus japonicus Stock

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Abstract
  • The fishery cooperative association of Akita Prefecture closed the sailfin sandfish Arctoscopus japonicus fisheries from 1992 to 1994 to rehabilitate the stock. Following the temporary closure, the total allowable catch (TAC) has gradually increased. The aim of this study is to evaluate the effects of the fishery moratorium and other restrictions for this stock using several scenarios involving age-structured models and ocean environmental factors. The following results were obtained: 1) stock biomass (SB) did increase during the fishing moratorium; 2) if more prefectures, including Aomori, Akita, Yamagata and Niigata had also implemented the moratorium, a greater increases in SB would have been realized; 3) if a 30% reduction in fish harvest had been implemented from 1980 to 1982 when the ocean environmental condition was relatively good, SB would have recovered; 4) SB would not have recovered if the moratorium had not been implemented; 5) if exploitation rated E[t] could be tightly controlled, a constant exploitation rate policy of E[t] - 0.4 would be a better policy compared to other policies based on Monte-Carlo simulation tests; and 6) if E[t] can not be controlled at a constant level, a short-term reduction policy of Et, for example, a 30% reduction during the 3 years when stock size was very low, would be very effective. In particular, when the ocean environmental condition is good, this policy works effectively.
  • Keywords: age-structured model, Fisheries Economics, Theoretical and Empirical Bio-Economic Analysis, fishing moratorium, environmental factor, Arctoscopus japonicus, management policy, sailfin sandfish
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  • Watanabe, Kyuji, Hideki Sugiyama, Shigeo Sugishita, Naoki Suzuki, Kazumi Sakuramoto. 2004. A Management Policy for North Japan Sea Sailfin Sandfish, Arctoscopus japonicus Stock. Peer Review: No. In: Proceedings of the Twelfth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 20-30, 2004, Tokyo, Japan: What are Responsible Fisheries? Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2004. CD ROM. ISBN 0-9763432-0-7
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