Abstract
Sexual dimorphism was shown in the epidermis of 2‐year‐old rainbow trout. The changes in the epidermis which appear normally at the spawning time can be timed earlier by advancing the normal annual photoperiod cycle by three months.The epidermis of the advanced fish was significantly thicker than that of the control fish during the winter preceding spawning. For most of the year the epidermis of the males was thicker than that of the females, but females had more mucous cells in the epidermis than males. The maximum concentration of plasma testosterone coincided with the epidermal thickening.
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