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Two proteinase inhibitors were separated from the crude extract of chum salmon Oncorhynchus keta muscle by DEAE-cellulose chromatography and some of their properties were examined. Consequently, the existence of calpastatin and trypsin inhibitor in chum salmon muscle was recognized and their properties were similar to the reported fish muscle, respectively. Each inhibitor activity in the muscular tissue was compared between feeding and spawning stages. Significant difference was observed (p<0.05) in calpastatin and trypsin inhibitor activities between both stages and these activities were lower in the spawning stage than in the feeding stage.

The existence of proteinases in chum salmon muscle and their activities in the spawning stage.