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Nove dietas experimentais combinando níveis de substituição (0 , 50% e 100%) da farinha de peixe pelo farelo de soja, com três níveis de proteína bruta (28 , 30 e 32%), foram fornecidas para juvenis de apaiari (22,42 g) durante 84 dias. A sub stituição total da farinha de peixe afetou negativamente (p < 0,05) a sobrevivência, o ganho de peso, o consumo de ração e o fator de condição. Os peixes que receberam as dietas contendo somente farelo de soja apresentaram diminuição (p < 0,05) no índice hepat ossomático, no índice gorduro-viscerossomático e na porcentagem de lipídeo no fígado e no músculo. O ganho de peso foi maior (p < 0,05) para os peixes que receberam a dieta com 32% de proteína. A dieta contendo 28% de proteína bruta elevou (p < 0,01) o índice hepatossomático. O farelo de soja pode substituir 50% da farinha de peixe sem comprometer a performance. O nível de 32% de proteína bruta foi o que proporcionou o melhor desempenho. Nine experimental diets combining levels of substitution (0 , 50 and 100%) of the fish meal by soybean meal , with three levels of crude protein (28 , 30 and 32%) were supplied for oscar juveniles (22.42 g) during 84 days. The total replacement of fish meal by soybean meal inhibited the feed consumption and negatively affected (p < 0.05) the survival, weight gain and condition factor. Fish fed with the diet containing only soybean meal the hepatosomatic index, intraperitoneal fat ratio, liver lipid and muscle lipid were smaller (p < 0.05). The weight gain was better (p < 0.05) in the fish fed with the diet containing 32% of crude protein. The hepatosomatic index was bigger (p < 0.01) for the fish feed with the diet containing 28% of crude protein. Fish meal can be partially replaced in 50% by soybean meal. The best performance was obtained with the diet containing 32% of crude protein

Fontes e níveis de proteína bruta em dietas para juvenis de apaiari (<em>Astronotus ocellatus</em>)