Restrição alimentar na criação do Litopenaeus vannamei em sistemas de recirculação e de bioflocos

• Ano de defesa: 2018
• Autor(a) principal: Julio Cesar Maciel
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Produtividade; Camarão Peneídeo; Crescimento; Produção; Água Qualidade; Aquicultura; Produção animal; Camarão Criação; Camarão Alimentação e rações
• Link de acesso: http://hdl.handle.net/1843/BUOS-BC2GBN

Research with food restriction inducing compensatory growth in shrimp has shown to be a technique that allows around 25% saving with ration, capable of adjusting shrimp farming to the world demand for sustainable production, with reduction in nitrogen and phosphorus levels in the effluents in addition to less water use in production. In addition to the BFT (biofloc) system, another system that can be used in marine shrimp farming is the closed recirculation system (RAS). The latter system acts with water reuse, controlled temperature, filters to maintain water quality and minimum use of areas for shrimp production. In the present study, feed restriction was compared in the two closed systems described. Four treatments, RAS with a and without feed restriction and bioflocs (BFT) with and without feed restriction were used, all treatments in brackish water (16). Shrimps with a mean weight of 1.1 ± 0.23 g were distributed in 250 L boxes in duplicate interconnected to a mesoscom containing red tilapia. The water quality variables, such as, OD, pH, alkalinity and suspended solids were monitored daily; ammonia and nitrite weekly. Biometrics were performed every two weeks and corrections were made on daily feeding. The experiment was carried out for 60 days and no statistical differences were found between RAS and BFT shrimp growth, and no differences were observed between treatments, in relation to feed conversion and survival. However, a significant difference was observed in the animals growth with and without restriction of ration, being greater in animals without restriction, that is, no compensatory growth was observed during the ongrowing period (60 days). Comparing RAS with BFT system, the latter has advantages like lower energy consumption to maintain the water temperature, no filter problems and so on.