Níveis de alimentação para produção econômica de juvenis de tilápias-do-Nilo em tanques-rede

• Ano de defesa: 2013
• Autor(a) principal: Cabral, Bruna Lima [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Tilapia (Peixe); Tilápia-do-Nilo; Peixe - Criação; Peixe - Alimentação; Desempenho; Fishes
• Link de acesso: http://hdl.handle.net/11449/108426

This study aimed to evaluate the performance and economic impacts in the production of the Nile tilapia reared in cages with different feeding levels. Were used a completely randomized design with five treatments consisted of feeding levels 3 , 4 , 5 , 6 and 7 % of body weight/day (BW/day) with 3 replicates. Cages were used with volume of 1m³, in which were stocked 90 fishes with an initial weight of 100 grams. Variables related to the productive performance were evaluated, as body composition, feed efficiency, and physiological indexes and performed economic analysis. Data were submitted to analysis of variance and polynomial regression and economic analysis were performed by partial budgets methodology. The average mortality did not differ. The variables weight gain, feed conversion rate, specific growth rate, protein efficiency rate showed quadratic behavior in relation to levels of feeding. The feeding level 6.14% BW/day showed the greatest weight gain and feed conversion. The treatment 3% BW/day resulted in the lowest feed conversion. The retention efficiency of protein had a linear effect over the levels. The mean proportion of crude protein and ether extract in weight gain and the mean of physiological indexes did not differ. The feeding level of 5 % BW/day was the one that had better economic performance