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首页> 外文期刊>Fish Physiology and Biochemistry >Plasma insulin-like growth factor-I concentrations in yearling chinook salmon (Oncorhynchus tshawytscha) migrating from the Snake River Basin, USA
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Plasma insulin-like growth factor-I concentrations in yearling chinook salmon (Oncorhynchus tshawytscha) migrating from the Snake River Basin, USA

机译：从美国蛇河流域迁徙的一岁奇努克鲑（Oncorhynchus tshawytscha）中的血浆胰岛素样生长因子-I浓度

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摘要

During the parr-to-smolt transformation (smoltification) of juvenile salmonids, preadaptive changes in osmoregulatory and ionoregulatory ability are regulated in part by the growth hormone (GH)/insulin-like growth factor-I (IGF-I) axis. If food intake is sufficient, plasma IGF-I increases during smoltification. On the other hand, plasma IGF-I typically decreases in fasting fish and other vertebrate animals. Because food availability is limited for juvenile salmonids undertaking an extended 6- to 12-week spring migration to and through the Snake-Columbia River hydropower system ( northwestern USA), IGF-I concentrations might be expected to decrease, potentially compromising seawater tolerance. To address this possibility, yearling chinook salmon Oncorhynchus tshawytscha reared in three Snake River Basin hatcheries were sampled before release and at two downstream dams. Dry masses of migrating fish either did not increase during the migration ( in 2000, an average-flow year), or decreased significantly ( in 2001, a low-flow year). In both years, plasma IGF-I levels were significantly higher (1.6-fold in 2000, 3.7-fold in 2001) for fish sampled at the last dam on the lower Columbia River than for fish sampled prior to release. Plasma IGF-I concentrations in migrating fish may, nonetheless, have been nutritionally down-regulated to some degree, because plasma IGF-I concentrations in juvenile chinook salmon captured at a Snake River dam and transported to the laboratory increased in fed groups, but decreased in unfed groups. The ability of migrating smolts to maintain relatively elevated IGF-I levels despite restricted food intake and loss of body mass is likely related to smoltification-associated changes in hormonal balance.
机译：在幼体鲑鱼从小到大的转化过程中，渗透调节和离子调节能力的适应性变化部分受到生长激素（GH）/胰岛素样生长因子-I（IGF-I）轴的调节。如果食物摄入足够，则在糖化过程中血浆IGF-I升高。另一方面，血浆IGF-I通常在禁食鱼和其他脊椎动物中减少。由于进入和通过蛇哥伦比亚河水力发电系统（美国西北部）的春季和春季迁徙时间延长了6至12周的幼鲑鱼的食物供应有限，因此IGF-1的浓度可能会降低，从而有可能损害海水的耐受性。为了解决这种可能性，在释放之前和两个下游水坝的三个蛇河流域孵化场饲养的一岁奇努克鲑Oncorhynchus tshawytscha进行了采样。迁徙鱼类的干重在迁徙期间没有增加（在2000年为平均流量年），或者在迁徙过程中没有明显减少（在2001年为低流量年）。在这两年中，在哥伦比亚河下游的最后一个水坝采样的鱼的血浆IGF-I水平明显高于释放前采样的鱼（2000年为1.6倍，2001年为3.7倍）。不过，由于在蛇河大坝捕获并运输到实验室的少年朱努克鲑鱼的血浆IGF-I浓度在饲喂组中有所增加，但有所下降，但是在迁移的鱼类中血浆IGF-I的浓度可能在某种程度上被营养上调了。在未进食的人群中。尽管食物摄入受到限制和体重减轻，但迁移的软体动物仍能够维持相对较高的IGF-I水平，这可能与与软体动物相关的激素平衡变化有关。

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