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Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)

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タイトル: Effects of seawater transfer and fasting on the endocrine and biochemical growth indices in juvenile chum salmon (Oncorhynchus keta)
著者: Taniyama, Natsumi 著作を一覧する
Kaneko, Nobuto 著作を一覧する
Inatani, Yu 著作を一覧する
Miyakoshi, Yasuyuki 著作を一覧する
Shimizu, Munetaka 著作を一覧する
キーワード: Insulin-like growth factor-I
Insulin-like growth factor binding protein
Salmon
Salinity
Fasting
Growth index
発行日: 2016年 9月15日
出版者: Elsevier
誌名: General and Comparative Endocrinology
巻: 236
開始ページ: 146
終了ページ: 156
出版社 DOI: 10.1016/j.ygcen.2016.07.020
抄録: Insulin-like growth factor (IGF)-I, IGF-binding protein (IGFBP)-1 and RNA/DNA ratio are endocrine and biochemical parameters used as growth indices in fish, however, they are subjected to environmental modulation. Chum salmon (Oncorhynchus keta) migrate from freshwater (FW) to seawater (SW) at fry/juvenile stage weighing around 1 g and suffer growth-dependent mortality during the early phase of their marine life. In order to reveal environmental modulation of the IGF/IGFBP system and establish a reliable growth index for juvenile chum salmon, we examined effects of SW transfer and fasting on IGF-I, IGFBP-1 and RNA/DNA ratio, and correlated them to individual growth rate. Among serum IGF-I, liver and muscle igf-1, igfbp-1a, igfbp-1b and RNA/DNA ratio examined, muscle RNA/DNA ratio and muscle igfbp-1a responded to SW transfer. Serum IGF-I, liver igf-1 and liver RNA/DNA ratio were sensitive to nutritional change by being reduced in 1 week in both FW and SW while muscle igf-1 was reduced 2 weeks after fasting. In contrast, igfbp-1a in both tissues was increased by 2 weeks of fasting and igfbp-1b in the liver of SW fish was increased in 1 week. These results suggest that the sensitivity of igf-1 and igfbp-1s to fasting differs between tissues and subtypes, respectively. When chum salmon juveniles in SW were marked and subjected to feeding or fasting, serum IGF-I showed the highest correlation with individual growth rate. Liver igfbp-1a and -1b, and muscle igf-1 exhibited moderate correlation coefficients with growth rate. These results show that serum IGF-I is superior to the other parameters as a growth index in juvenile chum salmon in term of its stability to salinity change, high sensitivity to fasting and strong relationship with growth rate. On the one hand, when collecting blood from chum salmon fry/juveniles is not practical, measuring liver igfbp-1a and -1b, or/and muscle igf-1 is an alternative.
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/68544
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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