Influência da densidade de estocagem no desempenho zootécnico de Litopenaeus vannamei durante a fase de berçário em sistema de bioflocos
Palavras-chave:
camarão, bft, crescimento, sobrevivênciaResumo
O presente estudo avaliou o desempenho zootécnico do camarão marinho Litopenaeus vannamei quando cultivado em diferentes densidades de estocagem na fase de berçário em sistema de bioflocos. O experimento foi composto de quatro tratamentos com três repetições, correspondendo í s densidades de 1.500, 3.000, 4.500 e 6.000 camarões m-². Camarões com peso médio inicial de 0,004 g foram estocados aleatoriamente, conforme os tratamentos, em 12 tanques plásticos circulares, com área de fundo de 0,5 m2 e volume útil de 300 L (microcosmos) durante um período de 35 dias. Estes tanques foram conectados a um sistema de recirculação abastecido pela água de um tanque retangular de 200 m2 (macrocosmo), utilizado para o cultivo de L. vannamei na densidade de 300 camarões m-² em sistema de bioflocos. Os parí¢metros de qualidade de água se mantiveram dentro dos limites aceitáveis durante o experimento. Os resultados referentes ao desempenho zootécnico apresentaram diferenças significativas (P<0,05) entre os tratamentos. Os valores de peso final foram superiores nos camarões cultivados nas densidades de 1.500, 3.000 e 4.500 m-², enquanto que a sobrevivência foi significativamente reduzida nas densidades de 4.500 e 6.000 camarões m-². A densidade de 3.000 camarões m-2 foi julgada a mais adequada, considerando o desempenho zootécnico para o cultivo de L. vannamei na fase de berçário em sistema de bioflocos na região nordeste do Brasil.
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