Cultivo de matrinxã Brycon orthotaenia (Günther, 1864) em tanques-rede, em diferentes densidades de estocagem

Abstract

This experiment evaluated the development and survival of matrinxã Brycon orthotaenia juveniles reared during a 197-day experiment, in a 4 m 3 floating cage, in three stocking densities: 20, 40 and 60 fish m -3. Juveniles with 19.9 ± 0.3 cm of total length and 90.0 ± 0.15 g of weight were used. The animals were fed with floating pellets (commercial diet with 36% crude protein). The total length, and weight were higher (p <0.05) in the density of 20 fish m -3. The density of 40 and 60 fish m -3 showed intermediary and low values, respectively. Survival and Fulton condition factor were similar (p > 0.05) among the different densities; however, the produced biomass was higher (p < 0.05) in densities of 40 and 60 fish m -3. The increased stocking density showed a more homogeneous growth. The increase in stocking density for B. orthotaenia juveniles presented a higher biomass, homogeneity of fishes, lesser growth, but had no effect in survival.