Abstract
1. 1. Changes in protein composition and protease activity of juvenile chum salmon muscle upon treatment with sex steroids were investigated. 2. 2. A slight breeding color was observed on chum salmon following the oral administration of 17α-methyltestosterone. Sarcoplasmic protein significantly decreased, while ninhydrin-positive substances from protein-free fractions significantly increased upon treatment with 17α-methyltestosterone. Autolytic activity of the fish treated with 17α-methyltestosterone drastically increased. 3. 3. Estradiol-17β did not significantly influence the protein composition and autolytic activity. 4. 4. These results indicate that androgen is closely related to the deterioration of chum salmon muscle.
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