Desempenho de tilapias do Nilo Oreochromis niloticus suplementados com derivados da parede celular de leveduras Saccharomyces cerevisiae

Abstract

With increasing human consumption by fish the best way to increase the efficiency of production is the population density, but this brings a higher susceptibility to disease as a result of water quality and conditions of stress increase. Alternatively to increase productivity without the occurrence of disease outbreaks in fish during the production cycle, dietary supplements (probiotics, prebiotics and immune stimulants) can be used as MOS (MOS) and glucans (β-glucans). The aim of the study was to evaluate the efficacy of prebiotic diet on survival and growth of Nile tilapia. This project proposed the installation of an experiment within the city of Sulina-PR community Surubí Line. Cages 12 with a capacity of 1 m³ were used. And the maintenance of appropriate levels of dissolved oxygen in the pond, two (2) aerators were used. The basis for the manufacture of the final product with the paste was provided by the company supra. With the formulation of the ration from the company, the mixture with the following treatments, witness 0.2% MOS, 0.2% and 0.1% MOS glucans + 0.1% glucan was performed. The conduct of the experiment conducted for 60 days from deployment on 19 October 2013 Driving occurred under normal growing conditions, where climatic conditions were not controlled. Only parameters of water quality, both physical and chemical, were monitored weekly. The average density used was 4,100 kg / cage. The fish were fed extruded feed, with 4.0 mm diameter. The feed was given twice a day: at 09h and 15h, until satiety. Complete 60 days of experiment, the fish were subjected to fasting for 24 hours, sedated on ice, weighed on a precision scale and measured with ictiômetro. Data were subjected to analysis of variance, and significant parameters for the comparison Tukey test (α = 5%) were used, using the ASSITAT 7.7 statistical program. The results showed that the dosages administered to MOS (MOS) and Beta-glucans in the diet were not effective as prebiotics in Nile tilapia. It is suggested that more studies be conducted in the cultivation environment to better elucidate the action of prebiotics in tilapia.