A 56 day feeding trial was conducted to determine the suitability of moringa leaf meal fermented with Rhyzopus sp. (MLMF) as an alternative to soybean meal (SBM) in the diets of tambaqui. The fish with an average weight of 0,81 ± 0,63 g are reared in 15 cages at a stocking density of 25 fish/cage. This study uses completely randomized design (CRD) with one factor, with 5 treatments and 3 …