Apparent digestibility of juveniles of matrinxã Brycon amazonicus fed diets with different protein levels

The objective of the present study was to determine apparent digestibility juveniles matrinxã Brycon amazonicus fed diets with different levels protein. experimental design completely randomized, where treatments consisted four protein in (28, 32, 36 and 40%) five replicates (water boxes) 10 each. Diets were offered times a day, feces collected twice week, along 28 days, for analysis. Data subjected polynomial regression at 5% significance. Differences (p<0.05) observed dry matter digestibility, higher according increasing diets. This behavior directly expressed nutrients by matrinxã, such as % ash, crude protein, digestible energy, energy energy: ratio. However, this not (p > 0.05) ether extract. Digestibility N, P, Ca, Mg, Cu Zn presented linear positive < behavior, which use these minerals increased increase level K, Fe Mn reduced Thus, it can be concluded that rise improves nutrient digestibility. results indicated 40% provided better results.