Protein requirement in the diet of <scp> <i>Heros severus</i> </scp> (Heckel, 1840): An Amazonian ornamental fish

Two experiments to determine the crude protein (CP) requirement of Heros severus were performed. Five isocaloric (3,200 kcal kg−1 digestible energy) diets containing five levels CP (28, 32, 36, 40, and 44%) evaluated. In first, 75 fingerlings distributed among 15 aquaria (30 L). second experiment, 100 juveniles 20 (50 A quadratic effect on weight gain, specific growth rate for length, feed intake, conversion, body proteins, lipids, ash content occurred with increasing dietary CP, optimum values estimated at 41.86, 40.30, 40.97, 39.60, 43.55, 40.64, 37.77, 37.50% respectively. linear efficiency ratio CP. weight, hepatosomatic index, lipids observed 37.03, 37.20, 38.40, 35.13, 38.78, 34,74% ratio, viscerosomatic index Blood glucose hematocrit had lower in fed a low level