To evaluate the effect of different levels of tucumã peel on the zootechnical performance, biochemical and hematological parameters of tambaqui fish. We used 225 fishes from a farm located on Manuel Urbano road (AM-070), with an average weight of 23.29 ± 15.02 g. The fishes were transported in plastic bags containing water and oxygen to the Federal University of Amazonas-UFAM, where the experiment was carried out. They were distributed in fifteen aquariums with 310 liters of capacity, and were fed until apparent satiety twice a day, with the following percentages of tucumã peel: T1: no tucumã peel, T2: 3% tucumã peel, T3: 6% tucumã peel, T4: 9% tucumã peel, T5: 12% tucumã peel. The research lasted 45 days and during this experimental period, due to its flow and aeration characteristics, an artesian aquifer provided the water, whose quality was monitored constantly. The tests carried out were: (1) standard biometry every 15 days for the analysis of zootechnical performance parameters, and (2) in a final analysis for hematological and biochemical indicators, blood was extracted by a puncture in caudal vein with a syringe of 3 ml. containing anticoagulant, so the fish were anesthetized with 0.5 mg/L of benzocaine diluted in water, and remained without feeding for a period of 12 h. The results obtained were: no differences in zootechnical performance or hematological parameters were observed. In the biochemical analyzes, there were no significant differences for proteins and glucose, while for cholesterol and triglycerides there was a decrease with the increasing levels of tucumã peel.
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