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Profiles of circulating insulin-like growth factor-I during smoltification of masu salmon reared under different conditions

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タイトル: Profiles of circulating insulin-like growth factor-I during smoltification of masu salmon reared under different conditions
著者: Kaneko, Nobuto 著作を一覧する
Iijima, Anai 著作を一覧する
Shimomura, Takahiro 著作を一覧する
Nakajima, Takuro 著作を一覧する
Shimura, Haruka 著作を一覧する
Oomori, Hajime 著作を一覧する
Urabe, Hirokazu 著作を一覧する
Hara, Akihiko 著作を一覧する
Shimizu, Munetaka 著作を一覧する
キーワード: Masu salmon
Smoltification
Insulin-like growth factor-I
Na+,K+-ATPase
Survival
発行日: 2015年 7月
出版者: Springer
誌名: Fisheries science
巻: 81
号: 4
開始ページ: 643
終了ページ: 652
出版社 DOI: 10.1007/s12562-015-0870-y
抄録: We compared profiles of serum insulin-like growth factor (IGF)-I levels during smoltification of masu salmon reared under different environments, hatcheries and growth histories. Masu salmon from the Kenichi River in Hokkaido showed a sharp increase in serum IGF-I from April to May, followed by a peak of gill Na+,K+-ATPase (NKA) activity. Fish at Kumaishi Hatchery had an IGF-I profile similar to that of the river fish, while the increase in gill NKA was lower. At Shimamaki Hatchery, interval feeding during winter appeared to suppress the spring IGF-I peak. At Kumaishi Hatchery, a difference in size during smoltification affected IGF-I levels at release, but the numbers of adults that returned to the release site were not significantly different. In the following year, three release groups differing in winter size and/or spring growth (Large-High, Large-Low and Small-High) were created. Large-High and Small-High fish showed a higher IGF-I peak than Large-Low fish in April, while smolt-to-adult return of Large-High fish was highest. These results suggest that in smolting masu salmon in freshwater, circulating IGF-I level alone is not a predictor of long-term survival in seawater. However, since growth history in freshwater affected the smolt-to-adult return, optimizing rearing conditions is a critical component of hatchery releases for masu salmon.
Rights: The final publication is available at www.springerlink.com
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/59771
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 清水 宗敬

 

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