Evaluation of growth status using endocrine growth indices, insulin-like growth factor (IGF)-I and IGF-binding protein-1b, in out-migrating juvenile chum salmon

Kaneko, Nobuto; Torao, Mitsuru; Koshino, Yousuke; Fujiwara, Makoto; Miyakoshi, Yasuyuki; Shimizu, Munetaka

Evaluation of growth status using endocrine growth indices, insulin-like growth factor (IGF)-I and IGF-binding protein-1b, in out-migrating juvenile chum salmon

Kaneko, Nobuto; Torao, Mitsuru; Koshino, Yousuke et al.

General and Comparative Endocrinology, 2019, 274, 50-59

Permalink : https://hdl.handle.net/2115/77218

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アクセス権	open access
URI	https://hdl.handle.net/2115/77218
タイトル	Evaluation of growth status using endocrine growth indices, insulin-like growth factor (IGF)-I and IGF-binding protein-1b, in out-migrating juvenile chum salmon
著者	Kaneko, Nobuto ; Torao, Mitsuru ; Koshino, Yousuke ; Fujiwara, Makoto ; Miyakoshi, Yasuyuki ; Shimizu, Munetaka
著者名 Kaneko, Nobuto
著者名 Torao, Mitsuru
著者名 Koshino, Yousuke
著者名 Fujiwara, Makoto
著者名 Miyakoshi, Yasuyuki
e-Rad_Researcher 90431337 著者名 Shimizu, Munetaka
言語	英語
キーワード	Growth evaluation
	Insulin-like groactor binding protein-1bwth f
	Insulin-like growth factor-I
	Oncorhynchus keta
	Out-migrating juveniles
発行日	2019-04-01
出版者	Elsevier
収録物名	General and Comparative Endocrinology
巻(号)	274
ページ	50-59
抄録	This study aimed to utilize circulating insulin-like growth factor binding protein (IGFBP)-1b as a negative index of growth to evaluate the growth status of juvenile chum salmon (Oncorhynchus keta) in the ocean. First, rearing experiments using PIT-tagged juveniles were conducted to examine the relationship of circulating IGFBP-1b with growth rate of the fish in May and in June. The serum IGFBP-1b level negatively correlated with fish growth rate in both months, suggesting its utility as a negative index of growth. Next, the growth status of out-migrating juveniles in northeastern Hokkaido, Japan, was monitored for 3 years using the growth indices. Serum levels of IGF-I, a positive index of growth, in fish collected from the nearshore zone were low in May and high in June of all years. Levels of serum IGFBP-1b showed a trend opposite to that of serum IGF-I. However, the IGF-I/IGFBP-1b molar ratios well reflected the seasonal and regional trends. These findings suggest that the juveniles in June left the nearshore area under better growth conditions. The present study also suggests that the use of multiple growth indices would improve the sensitivity and accuracy to evaluate the current growth status of out-migrating juvenile chum salmon.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0016-6480
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ygcen.2019.01.001