The present study aimed to investigate the effects of dietary carbohydrate and lipid levels on growth performance, protein utilization, body composition and hepatic lipid deposition in Nile tilapia (Oreochromis niloticus). Four diets with different carbohydrate and lipid ratios (carbohydrate level ranged from 7.64, 5.60, 4.04 and 3.60 while lipid level ranged from 4, 6, 8 and 9 were formulated and fed to tilapia for 90 days. After the feeding trial, high weight gain, specific growth rate (SGR), FE, PER, HIS and VSI % were observed in the groups with the CHO:L ratio of 5.60 (D2) and the lowest on D4 (3.60). Hepatosomatic and viscerosomatic index increased as dietary CHO: L ratios increased. Low serum TG, CHL and HDL levels were observed in the groups with the CHO: L ratio of 11.78 (D4) and 28.19 (D3). These results suggested that dietary carbohydrates have a stronger effect on hepatic lipid accumulation than dietary lipids in tilapia and diet with around 3.60 CHO: L ratio is suitable for tilapia culture concerning the growth performance, feed utilization and health. It could be concluded that an optimal dietary CHO: L ratio of 3.60 is suitable for tilapia culture concerning the growth performance and health. The present results will be of great significance in improving the utilization of dietary lipid and carbohydrate to achieve better nutrition efficiency in tilapia.
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