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Circulating insulin-like growth factor I in juvenile chum salmon: relationship with growth rate and changes during downstream and coastal migration in northeastern Hokkaido, Japan

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Title: Circulating insulin-like growth factor I in juvenile chum salmon: relationship with growth rate and changes during downstream and coastal migration in northeastern Hokkaido, Japan
Authors: Kaneko, Nobuto Browse this author
Taniyama, Natsumi Browse this author
Inatani, Yu Browse this author
Nagano, Yuta Browse this author
Fujiwara, Makoto Browse this author
Torao, Mitsuru Browse this author
Miyakoshi, Yasuyuki Browse this author
Shimizu, Munetaka Browse this author →KAKEN DB
Keywords: Chum salmon
Juvenile
Migration
Growth rate
RNA/DNA ratio
Insulin-like growth factor I
Issue Date: Aug-2015
Publisher: Springer
Journal Title: Fish physiology and biochemistry
Volume: 41
Issue: 4
Start Page: 991
End Page: 1003
Publisher DOI: 10.1007/s10695-015-0064-7
PMID: 25948054
Abstract: Chum salmon (Oncorhynchus keta) migrate to the ocean in their first spring, and growth during early marine life is critical for survival. We examined the validity of circulating IGF-I and muscle RNA/DNA ratio as indices of growth rate using individually tagged juvenile chum salmon fed or fasted for 10 days. Serum IGF-I level was highly, positively correlated with individual growth rate. Muscle RNA/DNA ratio also showed a positive correlation, but its relation was not as high as that of IGF-I. We next measured these physiological parameters in chum salmon juveniles caught at river, estuary, port and nearshore of the northeastern Hokkaido, Japan, from May to June in 2013 and 2014, respectively. In both years, there was a trend that serum IGF-I levels were high in nearshore fish and low in river/estuarine fish in June. In contrast, muscle RNA/DNA ratio showed no clear temporal and spatial patterns. The present study shows that circulating IGF-I can be used as a growth index in juvenile chum salmon. Monitoring growth status using serum IGF-I suggests that growth of juvenile chum salmon in the survey area was activated when they left the coast.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s10695-015-0064-7
Type: article (author version)
URI: http://hdl.handle.net/2115/62580
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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