The objective of the present study was to evaluate growth, biochemical, hematological and intestinal enzymes responses and survival of Nile tilapia juveniles fed a diet containing the essential oil of lemongrass Cymbopogum fl exuosus (EOCF) and infected by Aeromonas hydrophila. Five diets were evaluated (in quadruplicate) with increasing levels of EOCF (0.0 -control; 0.25; 0.50; 1.0 and 2.0 mL kg diet-1). On day 45, eight fi sh per treatment were sampled and blood, liver and intestine samples were taken. Others eight fi sh per treatment were infected with A. hydrophila followed by a 15day period of observation. Citral is the main constituent of EOCF. The inclusion of 2.0 mL EOCF kg diet-1 increased specifi c growth rate and survival after A. hydrophila infection and decreased feed conversion ratio of Nile tilapia. In general, higher concentrations of EOCF in the diet reduced plasma glucose and triglycerides levels, and increased plasma amino acids, alanine aminotransferase (ALT) and hepatic ALT levels, hematological parameters, and the activity of intestinal enzymes. It was concluded that the inclusion of 2.0 mL EOCF kg diet-1 improved growth performance, biochemical and physiological responses and decreased mortality of Nile tilapia after A. hydrophila infection.
RESUMOAvaliou-se nesta pesquisa o efeito de diferentes fontes de carboidratos no desempenho de alevinos de tilápia. Foram testadas quatro dietas isoproteicas com diferentes concentrações de farinha de manga 0; 33, 66, e 100% em substituição ao milho. O período de alimentação foi de 45 dias, e a taxa de arraçoamento foi de 8% da biomassa. Foram utilizados 360 alevinos de tilápia-do-nilo, com peso médio inicial de 2,08±0,13g, distribuídos em 12 caixas de 500L, em um sistema de recirculação de água com biofiltro. Foram avaliados índices de desempenho, consumo de ração, rendimento de carcaça e sobrevivência. Os resultados obtidos demonstraram que o ganho de peso individual, o ganho médio diário, a taxa de crescimento específico, o consumo de ração aparente, a conversão alimentar aparente e a sobrevivência não foram afetados pelas fontes de carboidratos testadas. O rendimento de carcaça foi influenciado pela farinha de manga na ração. Concluiu-se que o milho na dieta pode ser substituído 100% pela farinha de manga para a tilápia, sem prejudicar o desempenho. (0, 33, 66 and 100%)
Palavras-chave: peixe, nutrição, farinha de fruta, carboidratos
ABSTRACT
The aim of this study was to evaluate the effect of different carbohydrates on the performance of Tilapia fingerlings. Four isoproteic diets with different concentrations of mango meal
Relação proteína:carboidrato no desempenho e no metabolismo de híbridos dePseudoplatystoma fasciatum (fêmea) X Leiarius marmoratus (macho) (1.24; 0.84; 0.56 and 0.33
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