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A exigência proteica de alevinos de dourado foi avaliada por meio de dois ensaios, e as concentrações proteicas das dietas variaram de 32,29 a 57,63% no Experimento I e de 33,93 a 53,61% no Experimento II. O peso inicial dos alevinos foi de 0,75 e 5,68 g, para os Experimentos I e II, respectivamente. As dietas foram formuladas com ingredientes semipurificados e eram isoenergéticas dentro de cada ensaio. Os peixes foram alimentados até a saciedade aparente, duas vezes ao dia (9 e 16h), durante 29 dias no Experimento I e 94 dias no Experimento II. A análise de regressão revelou aumento linear do ganho em peso com o aumento da concentração proteica no Experimento I, indicando que a exigência proteica de alevinos de dourado de 0,75 a 3,04 g foi de, pelo menos 57,6% de proteína bruta. Já no Experimento II, a concentração proteica de 45,4% foi estimada como a exigência dietética para máximo ganho em peso, pela análise de regressão polinomial The dietary protein requirement of dourado fingerlings was evaluated by two feeding trials where the crude protein concentrations varied from 32.29 to 57.63% in trial I, and from 33.93 to 53.61% in trial II. Fingerling initial weights were 0.75 and 5.68 g, for trial I and II, respectively. Experimental diets were formulated with semipurified ingredients and were isoenergetic within each feeding trial. Fish were fed to apparent satiation, twice a day (9 and 4 p.m.), for 29 days in trial I and 94 days in trial II. Regression analysis revealed a linear increase in weight gain as the dietary protein concentration increased in Trial I, indicating that the protein requirement of dourado fingerlings from 0.75 to 3.04 g is, at least, 57.6%. In trial II, with bigger-size fish, 45.4% crude protein was estimated as the protein requirement for maximum weight gain by polynomial regressio

Exigência proteica em dietas para alevinos do dourado (Salminus brasiliensis)