Desempenho zootécnico e rendimento de filé do robaloflecha alimentado com diferentes dietas comerciais

Abstract

The objective of this work was to evaluate the effect of different commercial diets on the common snook performance, organo-somatic indices and carcass and fillet yield. Two different commercial diets for carnivorous fish were compared in the grow-out stage of the fishes: Feed A (46.6% CP and 9.8% fat) and Feed B (60.6% CP and 13.3% fat). Common snook juveniles with initial body weight mean of 355.40 ± 52,30 g were stocked in three tanks of 200 L at 15 fish m-3 stocking density (5.33 ± 0.12 kg m-3), at salinity of 15 g L-1 with three replicates. The treatments were composed by two independent water recirculation systems. At the end of the experiment, there were significant differences in all performance parameters analyzed, except standard length, with better results for fish fed with Feed B. For this feed, the fish reached an average weight of 501.10 ± 64.10 g, providing twice the growth rate and better feed conversion (1.17 ± 0.13) but showed higher values of visceral fat and liver somatic index compared to Feed A. The carcass yield and fillet analyzed showed no significant differences between treatments. The results indicate that under these experimental conditions the feed containing 60.6% CP and 13.3 fat ensures better growth performance of common snook grown for 42 days in the grow-out phase.