Value-per-recruit analysis of bighand thornyhead Sebastolobus macrochir caught off the Pacific coast of northern Honshu, Japan

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The yield-per-recruit (YPR) analysis has been used to assess growth-overfishing of exploited fish stocks. Since the ex-vessel price per weight widely depends on the size of the fish, the result of the YPR does not imply the revenue. The value-per-recruit (VPR) analysis, which is an economic expansion of the YPR analysis, was conducted for bighand thornyhead Sebastolobus macrochir caught off the Pacific coast of northern Honshu, Japan. The results showed that, under the current age at first capture (tc = 3), the current fishing mortality (F = 0.12) was close to optimum level. However, under the current F, optimum tc in the VPR model was 8 years and would lead to a 47% increase compared to the current revenue. The maximum YPR was obtained at tc = 6 years, but the revenue at tc = 6 only gave a 20% increase in the maximum revenue. The difference was caused by the size dependency of the ex-vessel price per weight. The VPR model would generate fisheries management plans with both economical and biological consideration and would help in making general consensus of fisheries management strategies.成長乱獲診断に広く用いられているYPR解析を拡張し、単価のサイズ依存を考慮したVPR 解析を、東北海域で漁獲されたキチジのデータに対して行った。その結果、現状の漁獲開始年齢（tc=3歳）では、現状の漁獲係数（F=0.12）は、最適なYPRやVPRを概ね達成しているが、現状のFを維持した場合、最適なtcはVPR解析とYPR解析で、それぞれ8歳と6歳、またその時の収入の増加はそれぞれ47％と20％となり、結果の差異が明らかになった。VPR解析が資源管理における合意形成に寄与することが期待される。
2011-07-01

Value-per-recruit analysis of bighand thornyhead Sebastolobus macrochir caught off the Pacific coast of northern Honshu, Japan

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