Dietary protein and exercise training effects on the physiological and zootechnical parameters of matrincha (Brycon amazonicus, Gunther 1869)

The aim of this study was to evaluate the combined effects of physical training and the dietary protein level on the hematological parameters, body proteins, lipids and ash content, food intake, conversion efficiency and growth ratio together with the swimming performance and the resistance to hypoxic stress in specimens of matrincha. The results indicate that the swimming performance and hematology are not altered by physical training or by the diet protein content; moreover, the resistance to hypoxia is increased by the exercise, as indicated by the lower levels of plasma glucose. Increased amount of protein in the diet and training improve feed conversion and mass gain in the animals, while enhanced food intake is related to training. The simultaneous application of those two factors causes a combined and improved effect on the mass gain and the conversion rates. Due to higher fat accumulation in the fillet, future assessment of stored fat type is suggested, as well as evaluation of market acceptance of the fish product.