Feeding of graded levels of lipid to gift juveniles cultured in inland ground saline water (Igsw): Changes in growth, metabolism and antioxidant status

A 60 days experiment was conducted to study the effect of different dietary lipid levels viz., TL₄, TL₆, TL₈, TL₁₀, TL₁₂, TP₁₄ and TL₁₆ on growth, hemato-biochemical, metabolic responses and anti oxidative status of GIFT tilapia juveniles reared in inland ground saline water (IGSW) of 15 ppt salinity. In indoor tank rearing system, a random distribution of 315 acclimatized fish (average BW 1.90±0.01g) @15 fish/tank was done in seven groups in triplicates. The results indicated that, the weight gain, metabolic growth rate, FER, ANPU and AST and ALT (hepatic and muscle) activities were increased (P<0.05) with increase in dietary lipid up to 10% and then decreased. Hepatic and muscle LDH activities significantly (P<0.05) decreased linearly with increasing dietary lipid. Significantly (P<0.05) higher SOD and CAT activities in both liver and gill was found in TL₁₀ group. Hepatic MDA content was lowest (P<0.05) in TL₄ and highest in TL₁₆ group. There was no significant (P>0.05) difference in liver and muscle MDH and haemato-biochemical parameters in relation to dietary lipid levels.. The present findings conclude that 10% dietary lipid is ideal to support growth, nutrient utilisation, metabolic and antioxidative status of GIFT tilapia juveniles reared in dynamic IGSW.