Influência de diferentes densidades de juvenis de pacu (Piaractus mesopotamicus) e tambacu (Piaractus mesopotamicus x Colossoma macropomum) submetidos ao sistema de bioflocos (BFT): dados preliminares

Abstract

The objective of this work was to evaluate the zootechnical performance of juveniles of Pacu (Piaractus mesopotamicus) and Tambacu (Piaractus mesopotamicus x Colossoma macropomum) submitted to different densities in the biofloc system. This experiment was carried out in the laboratory of pisciculture and aquaculture of the Federal University of Pampa, Campus Dom Pedrito, with duration of 23 days, the experimental units were arranged in two rows with five boxes, with a capacity of 500 liters, but supplied with 340 liters and constant aeration using a helical blower. The experimental design consisted of three treatments and three repetitions, where three densities (59 fish / m³, 118 fish / m³ and 176 fish / m³) were used. Feeding was done twice a day (9 and 16 hours), without water renewal. The design was completely randomized. The means were submitted to analysis of variance and "F" test, at a significance level of 5%. The averages were compared by the Tukey test. The statistical package used was R (2013). The results obtained in the experiment showed no significant differences for final weight, tissue growth, body condition factor, average daily gain, biomass, and survival between treatments. It is concluded that the density of 118 fish / m³ per experimental unit, reared in a biofloc system, shows a better zootechnical development of juveniles of Pacu (Piaractus mesopotamicus) and Tambacu (Piaractus mesopotamicus x Colossoma macropomum).