Desempenho zootécnico e composição centesimal de Tilápia do Nilo (Oreochromis niloticus) alimentada com diferentes rações comerciais

Abstract

The high cost of commercial feed is one of the gaps in aquaculture, which can seriously affect the sustainability and profitability of the activity. The objective of this study was to compare the zootechnical performance and centesimal composition of Nile Tilapia (Oreochromis niloticus) fed with different commercial fish feed that were administered to fish at the different stages of development from the stage of fry to grow-out. The trial was conducted in CEPAQ, in hapas at the density of 55 fish per square meter, in a causal design in triplicate. During the trial the fish were fed with 3 different commercial fish feed, with different protein levels and feeding frequencies. Biometrics were performed with a sample of 20% fish/hapa. Water quality variables were controlled daily: temperature, dissolved oxygen and pH. Weight gain, feed conversion, feed intake, final biomass, hepatosomatic and viscerosomatic index, buoyancy, grain size and uniformity of diets were evaluated. At the end of the trial there were no significant differences (p < 0.05) in water quality and zootechnical parameters. Significant differences (p >0.05) were observed among the treatments in the 4 mm fish feed for buoyancy, grain size and uniformity. Regarding the hepatosomatic and viscerosomatic indexes, there was a difference (p >0.05) among treatments. Based on the results obtained, it can be concluded that the three commercial fish feed have are good compositions that help in the development of fish in the grow-out stage