2026-03-14T22:14:35Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02001610 2025-06-30T02:18:46Z 12:14:1716955843765

ハンドリングがベニザケ幼魚の海水中における浸透圧調節機能に与える影響 Effects of handling stress on Osmoregulation of Juvenile Sockeye Salmon (Oncorhynchus nerka) in Seawater 伴, 真俊 バン, マサトシ Ban, Masatoshi sockeye salmon; handling stress; osmoregulatory ability Effects of handling stress on osmoregulatory ability of juvenile sockeye salmon (Oncorhynchus nerka) were investigated to assess responses of fish sampled for physiological studies. Yearling juveniles were initially reared in either fresh water (May) or natural seawater (August), and subsequently separated into three treatment groups. For each treatment, fish were placed in artificial seawater (33 ppt) using one of three handling methods. Fish were either carefully transferred to the seawater (Group 1), hung on a fishing hook and suspended in the seawater (Group 2), or confined in a small net and dipped into the seawater (Group 3). Serum sodium concentration and gill Na⁺, K⁺-ATPase activity were measured 4 hrs after transfer of fish. In May and August, the serum sodium concentrations of Groups 2 and 3 fish were significantly higher than that of Group 1 fish, whereas there was no significant difference in the gill Na⁺, K⁺-ATPase activity among three groups. These results indicate that handling stress may disturb osmoregulatory ability of fish in seawater without activating enzyme in the gills and that the serum sodium concentration increases in a short period. article さけ・ます資源管理センター the National Salmon Resources Center 2001-12 VoR application/pdf さけ・ます資源管理センター研究報告 4 1 5 Bulletin of the National Salmon Resources Center AA11339120 1344-7556 https://fra.repo.nii.ac.jp/record/2001610/files/salmon-k-k_4-1.pdf https://fra.repo.nii.ac.jp/records/2001610 eng 40005577060 salmon-k-k_4-1 open access