Energetic metabolism in muscle of tambaqui juveniles (Colossoma macropomum) fed with dietary açai (Euterpe oleracea Mart).

Açai, Euterpe oleracea, is an Amazonian fruit constituted for a noble profile of phytochemicals that coming recently studied in feed for aquaculture. The present study evaluated the hypotheses that in tambaqui juveniles, Colossoma macropomum, the lyophilized E. oleracea (LEO) should increase the muscle energetic potential from the optimization of energy fuels and reserves mobilization. These effects were predicted by higher growth performance and optimization feed utilization in a previous study. Fuels energy and reserves, besides electron transport system (ETS) and acetyl-CoA carboxylase (ACC) activity, were measured in the muscle of tambaqui. Fish were fed a control diet (0.00% LEO) or LEO diets with containing 0.63, 1.25, 2.50, 5.00, and 10.0% (w/w) of inclusion per 30-day. Fish fed from dietary 0.63% LEO had a significant reduction in triglycerides levels in the muscle when compared with the control group. LEO did not alter the content of cholesterol, glucose, glycogen and total protein in the muscle. However, there was an increment of ETS activity to 76.25% in tambaqui fed with the diet 1.25% LEO compared to the control group, indicating an important improvement in the muscle metabolic potential. These results suggest that açai has positive effects on the energetic metabolism of tambaqui due to its phytochemicals properties that probably derivate energy by food and additionally from lipolysis (triglycerides) promoting a muscular energy state that favor growth.