Comparative characterization of digestive proteases in redhead cichlid (Vieja melanurus) and twoband cichlid (Vieja bifasciata) (Percoidei: Cichlidae)

ABSTRACT In the Southeast of Mexico, there are many native cichlids with commercial interest such as redhead cichlid (Vieja melanurus) and twoband (V. bifasciata), which have a great local demand excellent meat quality. However, it is necessary to implement their culture based on nutrition studies digestive biochemistry. This study’s objective was characterize these two cichlids’ proteases (pH, temperature, inhibitors) through biochemistry techniques. Results showed that V. melanurus bifasciata capacity analogous other omnivore fishes, where optimal pH values stomach (4 2, respectively) intestinal (6 12, respectively), temperature acid (35°C 55°C, alkaline (45°C quite similar. Both species presented high thermal stabilities. Inhibition more sensitive specific inhibitors for than bifasciata. conclusion, bisfasciata different protease patterns. can hydrolyze protein ingredients formulate diet. Nevertheless, resistant presence inhibitors, allow include vegetable proteins in its