Performance and lipase activity in nile tilapia | Desempenho e atividade de lipase em tilápias do nilo

English. The objective was to evaluate the effects of temperature on performance and activity of lipase in the Nile tilapia, Thai lineage. The experimental design was completely randomized with four treatments (20, 24, 28 and 32ºC), six replicates and ten fishes per experimental unit. The diet was the same for all treatments. At 55 days of experiment were evaluated apparent feed intake, weight gain, apparent feed conversion, lipase activity and specific lipase activity. The apparent feed intake and weight gain increased linearly with temperature increase. For apparent feed conversion, quadratic effect was observed as a function of temperature, showing a conversion improvement of 1.79 to 1.00 with the increase of the temperature until 29,15ºC. Linear effect in lipase and specific lipase activities was observed too as a result of temperature, comprising high lipase activity at 32ºC. Water temperature influences the performance and amylase activity in Nile tilapia.

Spanish; Castilian. Objetivou-se avaliar os efeitos da temperatura no desempenho e na atividade de lipase de tilápias do Nilo, linhagem Tailandesa. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos (20, 24, 28 e 32ºC), seis repetições e 10 peixes por unidade experimental (aquário). Utilizou-se a mesma dieta para todos os tratamentos. Aos 55 dias do experimento foi avaliado o consumo de ração aparente, o ganho de peso, a conversão alimentar aparente, a atividade de lipase e a atividade específica de lipase. O consumo de ração aparente e o ganho de peso aumentaram linearmente (p