Suplementação da dieta de juvenis de tilápia criados em tanques bft (bioflocos) com dl-metionina

Francisco Roberto dos Santos Lima; Marcos Luiz da Silva Apoliano; Davi de Holanda Cavalcante; Marcelo Vinícius Carmo Sá

doi:10.1590/1809-6891v22e-63874

Autores

Francisco Roberto dos Santos Lima Universidade Federal do Ceará https://orcid.org/0000-0002-0368-2559
Marcos Luiz da Silva Apoliano Universidade Federal do Ceará https://orcid.org/0000-0002-4587-8509
Davi de Holanda Cavalcante https://orcid.org/0000-0002-0986-8370
Marcelo Vinícius Carmo Sá Universidade Federal do Ceará https://orcid.org/0000-0003-4457-2994

DOI:

https://doi.org/10.1590/1809-6891v22e-63874

Resumo

O presente estudo teve por objetivo determinar os efeitos da suplementação da ração balanceada de juvenis de tilápia do Nilo (peso médio inicial = 2,76 ± 0,06 g), submetidos à restrição na oferta de alimento artificial em tanques BFT de cultivo (18 juvenis/tanque 100 L), com DL-metionina, sobre a qualidade da água, composição dos bioflocos e desempenho zootécnico. Os tratamentos experimentais foram constituídos por dois grupos controle: 1 – sem restrição alimentar, sem suplementação com metionina; 2 – com restrição alimentar de 25%, sem suplementação com metionina. Os quatro tratamentos experimentais foram os seguintes: 1 – restrição alimentar de 25%, suplementação da ração com 0,5% de DL-metionina misturada à ração; 2 – restrição alimentar de 25%, suplementação da ração com 1,0% de DL-metionina misturada à ração; 3 – restrição alimentar de 25%, suplementação da ração com 2,0% de DL-metionina misturada à ração; 4 – restrição alimentar de 25%, suplementação do melaço em 1,0% de DL-metionina. A suplementação da ração balanceada com DL-metionina não afetou a qualidade da água de cultivo de juvenis de tilápia do Nilo, em tanques BFT, nem a composição centesimal do bioflocos. Após 8 semanas, o ganho em peso corporal dos peixes mantidos nos tanques com restrição alimentar e suplementação da ração com 1% ou 2% de DL-metionina não diferiu (P>0,05) do observado nos tanques sem restrição alimentar. Concluiu-se que é possível restringir as taxas de arraçoamento de juvenis de tilápia do Nilo, mantidos em tanques BFT de cultivo, em 25%, sem prejuízo zootécnico, desde que se faça a suplementação da dieta com, pelo menos, 1% de DL-metionina.
Palavras-chave: Bioflocos. Aminoácido. Aquicultura. Qualidade de água.

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