Abstract
The present research evaluated the use of dietary carnitine supplementation and its effects on the growth, body composition, fatty acids, biochemical parameters, Insulin-like growth factor 1 (IGF-1) level and antioxidant activity, in grey mullet. Four experimental diets were prepared by adding carnitine at concentrations of 0, 400, 800, and 1200 mg kg−1 diet (C0, C400, C800 and C1200 respectively). After 9 weeks of the feeding trial, a significant increase in growth performance (except for Daily Growth Rate or DGR), carcass quality (crude protein and crude lipid), biochemical parameters (cholesterol, triglyceride, total lipid, free fatty acid or FFA, total protein, albumin, and globulin), plasma superoxide dismutase and glutathione peroxidase activities was detected in the fish fed on C800 diet, as compared to those fed on the other diets (P 0.05) differences were observed in moisture and crude ash contents among groups. Barring the C1200 diet, there was also a positive correlation between the plasma IGF-1 level and DGR. The results showed that the diet containing 800 mg kg−1 L-carnitine enhanced growth yield, feed utilization, and carcass quality; as well as biochemical and antioxidant activity of grey mullet. The authors concluded that the maximum recommended levels of L-carnitine in diets for grey mullet (Mugil cephalus) can be established at 800 mg kg−1.
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