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日本系シロザケ幼魚の夏季の分布と回遊経路 Summer Distribution and Migration Routes of Juvenile Chum Salmon (Oncorhynchus keta) Originating from Rivers in Japan 上野, 康弘 ウエノ, ヤスヒロ Ueno, Yasuhiro 上野 ウエノ Ueno 康弘 ヤスヒロ Yasuhiro 石田, 行正 イシダ, ユキマサ Ishida, Yukimasa 石田 イシダ Ishida 行正 ユキマサ Yukimasa metadata only access Migration; Oncorhynchus; Chum salmon; Juvenile; Okhotsk To clarify the migration routes of juvenile chum salmon (Oncorhynchus keta) originating from Japanese rivers, Japan-Russia cooperative surveys were undertaken in waters off southeastern Hokkaido, Sakhalin, and the Kuril Islands (excluding the 12 nautical mile (about 22km) zone of Russia), using a purse seine, a surface trawl net, dip-nets, and drift net in the summers of 1988-1992. Chum juveniles were caught in nearshore waters of southeastern Hokkaido and coastal waters (> about 22km) of the Kunashiri and Iturup Islands. In contrast, no juvenile was found in offshore waters (> about 46km) of the Sea of Okhotsk and the Pacific Ocean. We proposed following two hypotheses for the migration routes of juvenile chum salmon after they enter these coastal waters based on these findings. The first hypothesis is that juvenile chum salmon migrate to offshore waters of the Sea of Okhotsk and the second hypothesis is that they move within coastal (territorial) waters off the Kuril Islands. 1988-1992年の日露共同さけます幼魚分布調査の結果を基に夏季の日本起源シロザケ幼魚の回遊経路について解析を行った。調査は千島のロシア沿岸域(領海)を除く北海道,サハリン,千島列島の沿岸·近海においてまき網,表層トロール,たも網,および流し網により行なわれた。シロザケ幼魚は北海道および南部千島列島沿岸に分布していたが,千島列島および北海道の沖合いでは見られなかった。これらの知見から,シロザケ幼魚は,1北海道の沿岸を離れた後,オホーツク海へ回遊するかまたは 2千島列島のごく沿岸域を回遊するものと推測された。 遠洋水産研究所 The National Research Institute of Far Seas Fisheries 1996-03 eng departmental bulletin paper https://fra.repo.nii.ac.jp/records/2002199 enyo_k_33-139 https://agriknowledge.affrc.go.jp/RN/2010541299 日本農学文献記事索引 （AgriKnowledge） AN00025949 0386-7285 遠洋水産研究所研究報告 Bulletin of National Research Institute of Far Seas Fisheries 33 9 139 147