Diferentes níveis proteicos na alimentação de juvenis de Tilápia em sistemas de bioflocos e recirculação de água

Abstract

The tilapia of Nile (Oreochromis niloticus) is a freshwater fish from the African continent, being one of the most developed species in the world. Among the tilapia breeding systems used, the bioflocosis system, which is made up of heterotrophic and nitrifying bacteria, has recently been highlighted, which allow the balance of water quality. Another method of creation that stands out is the water recirculation system (RAS), where water is regularly treated and reused. In the early stages of tilapia breeding, both breeding methods can be used and the use of rations with crude protein levels of 36-40% is recommended. Therefore, a detailed study for the evaluation of the most efficient protein level between the biofloc system and RAS, allows the reduction with feed costs and optimization of the space for intensive production. The objective of this work was to analyze the performance of tilapia juveniles fed diets containing three different protein levels (28, 33 and 38%) in the biofloc system and RAS. The present work will be carried out in the fishery laboratory of the Universidade Federal da Fronteira Sul - Campus Laranjeiras do Sul. The treatments will be carried out in triplicates, totaling 18 experimental units of 50L stocked with 15 juveniles, totaling 270 animals. At the end of the study, the zootechnical performance of tilapia juveniles was evaluated, analyzed for the ANOVA assumptions by the normality test, later submitted to multivariate analysis of variance (MANOVA) and the Tukey mean separation test. During the experiment, seven boxes of the biofloc system were lost, possibly by clogging the gills through the solids. It was not possible to compare the most efficient system for the cultivation of tilapia juveniles. Therefore, new studies are needed to identify the best phase of Nile tilapia cultivation in the biofloc system.