Integration between bioflocs and periphyton in Nile tilapia culture Tanks/Integracao entre bioflocos e perifiton em tanques de cultivo da tilapia do Nilo

• Published in: Acta scientiarum. Technology 2017-12, Vol.39 (SI), p.601
• Main Authors: Cavalcante, Davi de Holanda, Lima, Francisco Roberto dos Santos, Reboucas, Vanessa Tomaz, Sa, Marcelo Vinicius do Carmo e
• Format: Article
• Language: English
• ISSN: 1806-2563
• DOI: 10.4025/actascitechnol.v39i0.30123

The present study aimed to assess the possible beneficial effects of the integration between bioflocs and periphyton to the Nile tilapia's water quality and growth performance. There were four treatments with five replicates each: (1) Control: green waters, (2) Periphyton: substrate-based system, (3) BFT: bioflocs technology for aquaculture, and (4) Biophyton: integration between bioflocs and periphyton. Fish (1.63 [+ or -] 0.07 g) were reared for 10 weeks in twenty 250 L outdoor tanks. Two polyethylene boards were vertically set out in the Periphyton and Biophyton tanks as underwater substrates. The C: N ratios of water in the BFT and Biophyton tanks were adjusted to 15:1 with dry molasses applications. The concentrations of total ammonia nitrogen were higher in the Control and Periphyton tanks than in the BFT and Biophyton ones. On the other hand, the concentrations of reactive phosphorus were higher in the BFT and Biophyton tanks than in the Control and Periphyton ones. The fish final body weight, specific growth rate and fish yield have not differed between the tanks. The integration between bioflocs and periphyton has not brought clear benefits to tilapia culture on water quality and growth performance. Keywords: aquaculture, Oreochromis niloticus, water quality. O presente trabalho teve por objetivo determinar os possiveis efeitos beneficos da integracao entre bioflocos e perifiton na qualidade de agua e no desempenho zootecnico da tilapia do Nilo. Trabalhou-se com quatro tratamentos com cinco repeticoes cada: (1) Controle: aguas verdes, (2) Perifiton: sistema de cultivo baseado em substrato, (3) BFT: tecnologia bioflocos para aquicultura e (4) Biofiton: bioflocos + perifiton. Os peixes (1,63 [+ or -] 0,07 g) foram mantidos por dez semanas, em 20 tanques externos de 250 L. Duas pranchas de polietileno foram posicionadas verticalmente, nos tanques Perifiton e Biofiton, como substratos submersos. A relacao C: N da agua dos tanques BFT e Biofiton foi ajustada para 15:1 pela aplicacao de melaco a agua. As concentracoes de nitrogenio amoniacal total foram maiores nos tanques Controle e Perifiton do que nos tanques BFT e Biofiton. Por outro lado, as concentracoes de fosforo reativo foram maiores nos tanques BFT e Biofiton que nos tanques Controle e Perifiton. O peso corporal final, a taxa de crescimento especifico e a produtividade de peixe nao diferiram entre os tanques. A integracao entre bioflocos e perifiton nao apresentou claros beneficios para a cria