Impacto ambiental e parâmetros zootécnicos da produção de tilápia do Nilo (Oreochromis niloticus) sob diferentes manejos alimentares

• Ano de defesa: 2002
• Autor(a) principal: Baccarin, Ana Eliza [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Peixe - Alimentação; Impacto ambiental; Tilapia (Peixe); Desempenho; Peixe - Carcaças; Fishes
• Link de acesso: http://hdl.handle.net/11449/144139; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/08-09-2016/000200112.pdf

Male juveniles of Nile (Oreochromis niloticus) tilapia were stocked in 12 ponds of 300 m2, at a density of 1.7 fish/m2 to evaluate the effect of different food management on fish production and carcass characteristic. Four different treatments were studied as follows: natural foods and rations in pellets, extruded or minced. Completely randomized design with 4 treatments and 3 repetitions was used. The rations containing 30% crude protein and 3,000 kcal digestible energy were supplied twice daily, at a rate varying between 3 and 5% of total estimated biomassa. Chicken drops were used as natural food. Limnological variables monitored during the period were within acceptable levels required by the species. Total fish production was significantly different (P<0.05) and the highest values were obtained with ration in pellets (5,996.83 kg/ha) and extruded (5,440.74 kg/ha). The fish fed on ration presented higher contents of body fat (1.57 to 1.98%) and visceral (12.64 to 25.04%) compared to fish on natural food, which presented levels between 0.17 and 0%, respectively. Natural food treatment yielded lower fish production and fish with lower body fat; however, fish were highly accepted by a testing panel. While treatments that yielded higher fish production (rations) also higher percentage of visceral fat and high rejection by testing panel