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抄録
許容漁獲量制度が導入されている北海道噴火湾のケガニ資源について,資源管理方策を検討するため,甲長コホート解析(LPA)を適用し資源量推定を行うとともに,甲長に基づくYPR(YPR^L)モデルを開発し,資源診断を行った。推定した資源量は回復傾向にはないものの,近年比較的安定していた。YPR^Lモデルにより資源診断した結果,当資源の許容漁獲量設定に用いている漁獲死亡係数は,F_<0.1>の6割程度で充分安全な値であった。以上のことから,当面は現状の管理基準に基づいた資源管理を継続すべきであると判断された。
The hair crab fishery 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 (YPR^L) was conducted on the hair crab in Funka Bay. LPA is effective for assessing fish stocks with uncertain aging characteristics. YPR^L 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 YPR^L, the fishing mortality coefficient, which is used for calculating total allowable catch, was 60% of F_<0.1>, a sufficiently safe value. Consequently, we concluded that fisheries management should continue to be based on the existing reference points.
