| Sumario: | The objective of this work was to verify the zootechnical development and the quality of Colossoma macropomum fillet fed with diets containing different levels of inclusion of Spirulina platensis. The research was divided in two phases. In the first phase, with 60 days, a stocking density of 40 fish.m-2 was adopted, while in the second phase, with 105 days, 20 fish.m-2 was used. The animals were fed four times a day with commercial feed with the addition of 20% Spirulina (T1), 40% Spirulina (T2) and, as a control (C), commercial feed containing 50% crude protein (CP) was used. At the end of the first phase, no significant difference was observed in survival, or in the final biomass. Otherwise, the highest final average weight was observed in the control group (15.18 ± 0.57 g), being significantly higher than those obtained in T1 (12, 00 ± 1.40 g) and T2 (12.09 ± 1.22 g). In the second stage, there were also no significant differences among treatments in terms of survival and final biomass. But again, the highest final average weight was observed in the control, with 84.86 ± 8.44 g, significantly higher than those found in T1 (75.87 ± 6.00 g) and T2 (70.68 ± 6.16 g). When analyzing the quality of fillet, those obtained from fish fed 20% Spirulina (T2) were significantly higher than the others, in terms of protein (17.78 ± 0.04%), lipid (1.23 ± 0.04%) and energy (82.13 ± 0.18 kcal.100 g-1) levels.
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