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
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
复制标题
鲑鱼幼鱼的循环胰岛素样生长因子 I：与日本北海道东北部下游和沿海洄游过程中的生长速率和变化的关系
DOI：
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发表时间：
2015
影响因子：
2.9
通讯作者：
M. Shimizu
中科院分区：
文献类型：
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作者：
Nobuto Kaneko;Natsumi Taniyama;Y. Inatani;Yuta Nagano;M. Fujiwara;M. Torao;Y. Miyakoshi;M. Shimizu
鲑鱼(Oncorhynchus Keta)在第一个春天迁徙到海洋，早期海洋生物的生长对生存至关重要。在饲养或禁食10天后，我们检验了循环IGF-I和肌肉RNA/DNA比率作为生长速度指标的有效性。血清IGF-I水平与个体生长速度呈高度正相关。肌肉RNA/DNA比值也呈正相关，但相关程度不如IGF-I。接下来，我们分别于2013年和2014年5月至6月在日本北海道东北部的河流、河口、港口和近岸捕获鲑鱼幼鱼，测量了这些生理参数。在这两年中，有一种趋势，即6月份近岸鱼的血清IGF-I水平较高，而河流/河口鱼的血清IGF-I水平较低。相比之下，肌肉的RNA/DNA比值没有明显的时间和空间模式。本研究表明，循环中的IGF-I可以作为幼鲑鱼的生长指标。用血清IGF-I监测生长状况表明，调查区域的幼鲑鱼在离开海岸时生长活跃。
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.