Efeito do nível proteico e da relação energia: proteina no desempenho reprodutivo da matrinxã, Brycon amazonicus

Abstract

The present study evaluated the effect of protein concentration and energy to protein relation on the reproductive performance of matrinxã, Brycon amazonicus, the second main species in fish farming in the Northern region of Brazil. One hundred and twenty breeders were distributed in 12 experimental units, following a randomized design and fed four isocaloric diets (3.100 kcal/kg), containing 32, 36, 40 and 44% of crude protein and DE:CP ratio of 7.7 kcal/g. The protein level of 40% of CP and DE:CP ratio of 7.7 kcal/g resulted in significantly high fecundity, fertilization, hatchability and gonadossomatic index. Diets with the protein level of 36% and 40% influenced positively the sperm motility and concentration. The oocyte diameter, female spawning frequency and the hepatossomatic index were not influenced by the diets. The dietary protein concentration influenced the reproductive performance of matrinxã, and 40% CP with DE:CP ratio of 7.7 kcal/g was the most indicated for matrinxã broodstock.