Effect of Dietary Supplementation of Different Fiber Levels Obtained From Tucumã Peel on Zootechnical and Hematological Performance in Juvenile Tambaqui (Colossoma macropomum).

The present study evaluated the effects of dietary inclusion of fiber derived from tucumã peel (Astrocaryum aculeatum) on the zootechnical performance and physiological responses of juvenile tambaqui (Colossoma macropomum). Five approximately isonitrogenous and isoenergetic diets were formulated with increasing levels of tucumã peel (0%, 3%, 6%, 9%, and 12%). A total of 225 fish were distributed in a completely randomized design with three replicates per treatment. Ten fish per experimental unit were individually identified using microchips to allow accurate monitoring of individual growth while minimizing handling stress. After 45 days, growth performance, hematological parameters, and plasma biochemical indicators were evaluated. Dietary fiber inclusion did not affect growth performance or hematological parameters, which remained within normal physiological ranges. However, increasing fiber levels significantly reduced plasma cholesterol and triglyceride concentrations, suggesting a modulatory effect on lipid metabolism. The results indicate that tucumã peel can be included as a dietary fiber source for tambaqui without adverse effects on performance under the conditions tested, although further studies are needed to determine optimal inclusion levels and long-term effects.