Cultivo de tilápias em diferentes ambientes de criação.

Abstract

Among the fish farming systems practiced, the most intensive is due to the greater application of technologies, monitoring of water quality and greater control of environmental factors. Thus the objective of this work was to evaluate different cultivation environments for the production of Nile tilapia (Oreochromis niloticus) in intensive system. The experimental period had a duration of 60 days and four different environments were tested (T1- without water recirculation (Control), T2 - Bioflocosis System (BFT) without recirculation, T3 - Water recirculation system (RAS) + addition of probiotic (Embotic®) and T4 - Water Recirculation System (RAS), with five replicates each, totaling 20 experimental units. Two hundred and forty juveniles of tilapia with initial mean weight of 139.77 ± 9.03 g were distributed in twenty Water tanks with a capacity of 310 liters, with water temperature controlled by heaters and continuous aeration.The feed used was the extruded commercial, with 32% crude protein (CP) and pellets with a diameter of six millimeters , Which were readjusted weekly after the biometrics accomplishment, followed the performance of the animals and the monitoring of the chemical and physical quality of the culture environment. Randomly, with plots subdivided in time, and statistical analyzes were submitted to analysis of variance, level of 5% probability. The animals kept in the water recirculation system were the ones that obtained the best results (p <0.05) for the final weight and length, total and average daily weight gain, specific growth rate and survival and for the physical and chemical parameters Of the water, proving to be the most efficient among treatments. The water recirculation system (RAS) provided better zootechnical performance and better water quality.