Abstract.Artificially reproduced pacu,Colossoma mitreiBerg, fingerlings (initial weight 41 g) were stocked (100/m3) in plastic cages (1·0m3) within a freshwater reservoir. Three diets containing 30, 35 and 40 protein were tested in quadruplicate over a 76‐day experimental feeding period. Fish were fed 7 days a week, twice daily at a feeding regime of 4 body weight/day from stock to 100g and thereafter at 3 until harvest. Mean water temperature over the trial was 26·7°C. Significant differences were observed in total and daily gain and in protein efficiency ratio, while no differences were obtained in the feed conversion ratio between treatments. Based on this study a 35 protein ration is recommended for pacu within floating c
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