Effects of dietary lipid levels on growth, lipid deposition, oxidative stress and hepatic morphological changes in giant grouper, Epinephelus lanceolatus

The present study examined the effects of dietary lipid levels on growth performance, lipid deposition, oxidative stress and liver morphological changes in giant grouper, Epinephelus lanceolatus. Five isonitrogenous diets containing graded lipid levels (100, 125, 150, 175 and 200 g/kg diet) were applied to triplicate groups of grouper (mean weight: 17.59 ± 0.14 g) in a seawater recirculation system for 56 days. Dietary lipid levels from 100 to 200 g/kg exhibited no influence on weight gain, specific growth rate, protein efficiency ratio and feed efficiency of the fish. Grouper whole‐body and hepatic total lipid content, intraperitoneal fat ratio and oxidative stress (malondialdehyde content) increased linearly (p