Nippon Suisan Gakkaishi 71 (6), 935-941 (2005)

Length-based stock assessment and sheries management of hair crab Erimacrus isenbeckii in Funka Bay, Hokkaido, Japan


1Muroran Branch, Hokkaido Hakodate Fisheries Experimental Station, Muroran, Hokkaido 051-0013, 2Hokkaido Central Fisheries Experimental Station, Yoichi, Hokkaido 046-8555, 3Hachinohe Branch, Tohoku National Fisheries Research Institute, Hachinohe, Aomori, 031-0841, 4Graduate School of Fisheries Science, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan

The hair crab shery in Funka Bay, Hokkaido, has adopted a total allowable catch system. In order to examine management policy, a length-based population analysis (LPA) including yield per recruit (YPRL) was conducted on the hair crab in Funka Bay. LPA is eective for assessing sh stocks with uncertain aging characteristics. YPRL was developed for this study, as a method of calculating the YPR using parameters for each length class, which are estimated by LPA, instead of parameters for each age. The LPA model followed the population dynamics of this stock. Estimated abundance remained comparatively stable, but showed no recovery trend. As a result of YPRL, the shing mortality coecient, which is used for calculating total allowable catch, was 60% of F0.1, a suciently safe value. Consequently, we concluded that sheries management should continue to be based on the existing reference points.

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