Deterioration of chum salmon muscle during spawning migration—VI. Changes in serum protease inhibitory activity d during spawning migration of chum salmon ( Oncorhynchus keta)

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1. 1. A relation between muscle protease activity and serum protease inhibitory activity of chum salmon during spawning migration was studied with regard to their physiological states. 2. 2. The autolytic activity of chum salmon muscle significantly increased, while the trypsin inhibitory activity in serum significantly decreased during spawning migration. Serum trypsin inhibitor was inactivated following treatment with androgen. 3. 3. It was consequently proved that androgen was trigger to the inactivation of serum protease inhibitor, resulting in high levels of muscle protease activity during spawning migration.