Abstract
Administration of 17α-methyltestosterone (MT) to sexually immature chum salmon Oncorhynchus keta induced the nuptial coloration. MT-treated chum salmon at the feeding migration stage in the North Pacific Ocean might correspond to those at the spawning migration stage as judged from the following changes: protein and lipid contents in muscle, high levels of muscle protease activity, colorations of muscle and blood serum. The relation between changes in muscle composition and sex steroid was suggested strongly. It was proved that the androgen was trigger to the muscle deteriorations during spawning migration of chum salmon.
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