Abstract: Strains SW01, SW02 and SW03 that directly degraded sea cucumber protein were isolated from sea water by Martin medium (high salt). Strain SW03 with the strongest degradation ability was selected, and its morphology, physiological and biochemical characteristics and 16S rDNA were studied. The fermentation ability of SW03, Bacillus subtilis, Bacillus amyloliquefaciens, Lactobacillus plantarum and Leuconostoc mesenteroides were compared under the optimal fermentation conditions for 72 h. The changes of pH, biomass and water-soluble protein concentration in fermentation were investigated. The results showed that SW03 belonged to Staphylococcus sp. The optimal fermentation conditions were as follows: 26℃, 2.9% of inoculation volume, initial pH 6.9. The content of water-soluble protein reached to 108.2 g/L. Compared with the other four commercial strains, SW03 had higher biomass and water-soluble protein content in the stable stage with more stable pH. The strain SW03 can be used as a protein-degrading strain for further research and development.
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