Fontes e níveis de proteína bruta em dietas para juvenis de apaiari (Astronotus ocellatus) = Sources and levels of crude protein in diets for oscar juveniles (Astronotus ocellatus)

Abstract

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 (PNine experimental diets combining levels of substitution (0 , 50 and100%) 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) thesurvival, 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 dietcontaining 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% ofcrude protein.

Keywords

• farelo de soja
• farinha de peixe
• proteína animal
• proteín a vegetal
• exigência protéica
• valor nutricional
• soybean meal
• fish meal
• animal protein
• vegetable protein
• protein requirement
• nutritional value