Moritella viscosa (Vibrio viscosus) is the causative agent of winter ulcers in farmed salmonids, and bacteria have been isolated from various marine fish species. The protease activity at 6ºC and 16ºC of M. viscosa strain were studied. Substrate gel electrophoresis with gelatin and casein as the substrates showed that M. viscosa strain had two different proteinase bands, 73.5 and 67.5 kDa.
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