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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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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/59771

Title: Profiles of circulating insulin-like growth factor-I during smoltification of masu salmon reared under different conditions
Authors: Kaneko, Nobuto Browse this author
Iijima, Anai Browse this author
Shimomura, Takahiro Browse this author
Nakajima, Takuro Browse this author
Shimura, Haruka Browse this author
Oomori, Hajime Browse this author
Urabe, Hirokazu Browse this author
Hara, Akihiko Browse this author →KAKEN DB
Shimizu, Munetaka Browse this author →KAKEN DB
Keywords: Masu salmon
Smoltification
Insulin-like growth factor-I
Na+,K+-ATPase
Survival
Issue Date: Jul-2015
Publisher: Springer
Journal Title: Fisheries science
Volume: 81
Issue: 4
Start Page: 643
End Page: 652
Publisher DOI: 10.1007/s12562-015-0870-y
Abstract: 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
Type: article (author version)
URI: http://hdl.handle.net/2115/59771
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 清水 宗敬

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