Criação do camarão Litopenaeus schmitti com diferentes salinidades e níveis de proteina na dieta em sistema de bioflocos
Palavras-chave:
camarão branco, sistema sem troca de água, agregado microbianoResumo
O objetivo deste trabalho foi verificar o efeito de níveis de proteína na dieta sobre a qualidade de água, composição dos bioflocos e desempenho zootécnico do camarão Litopenaeus schmitti criado em diferentes salinidades e utilizando a tecnologia de bioflocos. Juvenis de L. schmitii (2,43 ± 0,35 g) foram mantidos em tanques com 400 L (40 camarões m-²) em três salinidades (19, 26 e 33) e alimentados com duas dietas comerciais (30 e 40% de proteína bruta) durante um período de 35 dias. Entre os parí¢metros de qualidade de água monitorados, as concentrações de nitrito foram afetadas pela interação dos fatores salinidade e nível proteico da dieta e pela salinidade, isoladamente (P<0,05). O desempenho zootécnico dos camarões foi afetado apenas pelos fatores, salinidade e proteína da dieta, isoladamente (P<0,05). Quanto í proteína da dieta, a eficiência proteica indicou que os camarões utilizaram melhor este nutriente quando foram alimentados com a ração contendo teor proteico de 30% (2,23 ± 0,31) em relação í de 40% (1,87 ± 0,16) (P<0,05). Com relação í salinidade, a sobrevivência dos camarões apresentou valor mais elevado na maior salinidade (P<0,05). Contudo, os resultados demonstram que a composição microbiológica dos bioflocos foi afetada pelos fatores avaliados e a criação de L. schmitti com a tecnologia de bioflocos, em qualquer uma das salinidades utilizadas, pode ser realizada com o fornecimento de dieta com o menor nível proteico, para obtenção de melhor desempenho produtivo da espécie.
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