The adaptation period to the ration and the environment was 10 day, and during this period, the animals received an experimental ration of 32% CP (Table 1). The fish were fed twice a day (at 09 h and at 15 h) at a daily feeding rate of 2% of the biomass. During the experimental period of 120 days, males and females were maintained separately in reproductive rest, broodstock of both sexes were fed the experimental rations.