银大麻哈鱼（Oncorhynchus kisutch）在稚鱼向幼鱼转化过程中皮质醇对血浆电解质和甲状腺激素的影响。

Cortisol effects on plasma electrolytes and thyroid hormones during smoltification in coho salmon Oncorhynchus kisutch.

作者信息

Redding J M, Patińo R, Schreck C B

机构信息

Oregon Cooperative Fishery Research Unit, Corvallis 97331.

出版信息

Gen Comp Endocrinol. 1991 Mar;81(3):373-82. doi: 10.1016/0016-6480(91)90164-2.

DOI:10.1016/0016-6480(91)90164-2

PMID:2055437

Abstract

Plasma concentrations of Na+, K+, triiodothyronine (T3), and thyroxine (T4) and muscle water content were measured in yearling coho salmon. Oncorhynchus kisutch, after injection of cortisol in April, May, and June in fresh water (FW) and during acclimation to seawater (SW). Cortisol (17-21 micrograms/g), injected intraperitoneally in a melted cocoa butter suspension, suppressed the rise of plasma Na+ during SW acclimation in April but not in May or June. Muscle water content increased during SW acclimation in cortisol-treated fish in April and June. These observations suggest a hypoosmoregulatory function for cortisol during SW acclimation. Cortisol treatment also induced elevations of plasma K+ in FW (April only) and SW (April and May only). Cortisol treatment increased plasma T3 during SW acclimation in June and T4 in FW in May. The results suggest that cortisol may modify osmoregulatory processes and thyroid hormone activity during smoltification and acclimation to SW in yearling coho salmon.

摘要

在一岁大的银大麻哈鱼（Oncorhynchus kisutch）中测量了血浆中钠（Na+）、钾（K+）、三碘甲状腺原氨酸（T3）和甲状腺素（T4）的浓度以及肌肉含水量。这些鱼于4月、5月和6月在淡水中注射皮质醇后，以及在适应海水的过程中进行了相关测量。以融化的可可脂悬浮液腹腔注射皮质醇（17 - 21微克/克），抑制了4月海水适应期间血浆Na+的升高，但5月和6月未出现这种情况。在4月和6月，经皮质醇处理的鱼在海水适应期间肌肉含水量增加。这些观察结果表明，在海水适应过程中皮质醇具有低渗调节功能。皮质醇处理还导致淡水中（仅4月）和海水中（仅4月和5月）血浆K+升高。皮质醇处理在6月海水适应期间增加了血浆T3，在5月淡水中增加了血浆T4。结果表明，皮质醇可能在一岁银大麻哈鱼的洄游期和适应海水过程中改变渗透调节过程和甲状腺激素活性。