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浮延縄の釣針沈降速度; 中西部太平洋まぐろ類委員会(WCPFC)における海鳥類混獲削減のための技術としての枝縄加重法の検討 Sinking Speed of Baited Hooks in Pelagic Longlines；Examination of Weighted Branch Line Required in Specincations of Seabirds Conservation and Management Measures of the Western and Central Pacific Fisheries Commission（WCPFC） Yokota, Kosuke 798 横田, 耕介 10392911 ヨコタ, コウスケ Minami, Hiroshi 689 南, 浩史 20371932 ミナミ, ヒロシ Hosono, Takashi 2013 細野, 隆史 70524809 ホソノ, タカシ Kiyota, Masashi 1821 清田, 雅史 10371931 キヨタ, マサシ A weighted branch lines is on of the available and effrtctive mltlgation measures for reducing ln ciden tal catch of seabirds in pelaglc longline fisheries. The sinking speeds of baited hooks on fbur types of weighted branch lines (weights from 45 g to 98 g and attachment points from 0 m to 4．0 m above the hooks at the leader）required in specincations of WCPFC seabirds conservation and management measures were examined in line-settlng experiments on a quay. We also preliminary examined sinking speeds of weighted branch lines uslng lead core lines or fluorocarbon leader to develop new weighting methods asa lternative to weights. The average sinking speeds of the baited hooks in depths from 0 to 5 m were 0.30～0.43 m/s in the weighted branch lines of the WCPFC specincation，and were0.19 m/s in the conventional nonweighted branch line. Results suggest that the-.30 m/s is the target sinking speed of the baited hooks when we develop and test new weighting regime or materials for branch lines．The use of a lead core line in the “sekiyama” part of the branch line（above the leader）with a short leader has the potential to sufnciently improve the sinking rate of baited hooks． ファイル名末尾が”_abs_j”のファイルは和文要旨 journal article 水産総合研究センター Japan Fisheries Research Agency 2009-09-30 VoR application/pdf application/pdf 水産技術 1 2 1 7 Journal of fisheries technology AA12359338 1883-2253 https://fra.repo.nii.ac.jp/record/2010466/files/fra_t_2_1_1.pdf https://fra.repo.nii.ac.jp/record/2010466/files/fish_t_2_1_1_abs_j.pdf https://fra.repo.nii.ac.jp/records/2010466 jpn fra_t_2_1_1 日本農学文献記事索引（AgriKnowledge） https://agriknowledge.affrc.go.jp/RN/2010782174 open access