Hydrolysis of raw fish proteins extracts by strains isolated from Argentinean freshwater fish.

Lactic acid bacteria (LAB) isolated from freshwater fish (hatcheries and captures) from Paraná river (Argentina) were analyzed by using culture-dependent approaches. The species belonging to (.) , . , . , . and (.) were identify as predominant by RAPD-PCR and 16 s rRNA gene sequencing. (H-17, S-30, B-42 and S-44) grew in raw fish extract and slightly reduced the medium pH (5.81-5.91). These strains exhibited moderate fish sarcoplasmic protein degradation (≤ 73 %) releasing small peptides and free amino acids, being alanine, glycine, asparagine and arginine concentrations increased in a higher extent (17.84, 1.47, 1.26 and 0.47 mg/100 mL, respectively) by S-44 strain at 96 h incubation. Interestingly H-17 was able to inhibit Results suggest that these strains would contribute to the development of new safe and healthy fishery products with improved nutritional and sensory characteristics.