Valor nutricional de alimentos alternativos para tambaqui (Colossoma macropomum)

The experiment was conducted in order to determine the chemical composition and apparent digestibility coefficients (ADC) of dry matter (ADCDM), crude protein (ADCCP), ether extract (ADCEE) and gross energy (ADCGE) of alternative foods for tambaqui. In the experiment were used 108 tambaquis with average weight of 165.3 ± 15.6 g, in six treatments and three replicates, being six fish per experimental plot. Six experimental rations were made, being a reference ration, based on soybean meal and corn, and the others containing 70% of the reference ration, and 30% of the foods tested (whole rice bran (WRB), hay meal of leucaena leaf (MLL), hay meal of cassava leaf (MCL), integral scrapings from cassava root (ISCR) and babassu meal (BM)). In order to evaluate the apparent digestibility of nutrients, the indirect method of collecting feces by decanting was used, using titanium dioxide as an inert indicator added to the diet in a concentration of 0.1%. Among the evaluated foods, the MLL, MCL and BM containing high levels of fiber, which reduces the food digestibility coefficients. Among the evaluated foods, WRB and ISCR showed higher ADCDM, ADCCP, ADCEE and ADCGE values, indicating that they could be used in tambaqui rations.