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Profiles of circulating insulin-like growth factor-I during smoltification of masu salmon reared under different conditions
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)
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Submitter: 清水 宗敬
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