Cultivo de matrinxã Brycon orthotaenia (Günther, 1864) em tanques-rede, em diferentes densidades de estocagem = Matrinxã Brycon orthotaenia rearing in floating cage in different stocking densities

Abstract

O presente experimento avaliou o desempenho e sobrevivência de juvenis de matrinxã Brycon orthotaenia cultivados em tanques-rede de 4 m3, por 197 dias, em três densidades de estocagem: 20, 40 e 60 peixes m-3. Foram utilizados exemplares com 19,9 ± 0,3 cm de comprimento total e 90,0 ± 0,15 g de peso. Os animais foram alimentados com ração extrusada contendo 36% de proteína bruta. O comprimento total e o peso foram superiores (p 0,05) entre as diferentes densidades; porém, a biomassa produzida foi superior (p This experiment evaluated the development and survival of matrinxã Brycon orthotaenia juveniles reared during a 197-day experiment, in a 4 m3 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) 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.

Keywords

• rio São Francisco
• Characidae
• tanques-rede
• espécie neotropical
• matrinxã
• São Francisco river
• Characidae
• floating cage
• neotropical fish