Pickering A D, Pottinger T G
Gen Comp Endocrinol. 1983 Feb;49(2):232-9. doi: 10.1016/0016-6480(83)90139-9.
A marked diel variation in plasma cortisol concentration was demonstrated in the brown trout, Salmo trutta L. For most of the year this variation took the form of an elevation of cortisol levels during the hours of darkness. There was some evidence of a phase shift from a peak at 2400 hr during the spring and early summer to a peak at 0400 hr during the late summer and early autumn. During the winter months a nocturnal elevation of plasma cortisol was not evident. A shorter, episodic elevation of plasma cortisol was associated with feeding in the brown trout. These findings are discussed in relation to the effects of stress and intensive cultivation on teleost fish.
在褐鳟（Salmo trutta L.）中发现血浆皮质醇浓度存在明显的昼夜变化。一年中的大部分时间里，这种变化表现为黑暗时段皮质醇水平升高。有证据表明存在相位变化，从春季和初夏的24:00达到峰值，转变为夏末和初秋的04:00达到峰值。在冬季月份，血浆皮质醇的夜间升高并不明显。褐鳟进食时会出现较短时间的、间歇性的血浆皮质醇升高。本文结合应激和集约化养殖对硬骨鱼的影响对这些发现进行了讨论。
