Effects of Dietary Protein and Lipid Levels on Growth, Feed Utilization, and Body Composition of Tire Track Eel (<em>Mastacembelus favus</em>) Fingerlings
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2025
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77
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This study aimed to determine the optimal protein and lipid levels for tire track eel (Mastacembelus favus) fingerlings. Nine test diets comprised three protein levels (40, 45, and 50%) and three lipid levels (6, 9, and 12%). The experiment was conducted in triplicate for 56 days. The initial sizes of fish varied from 3 to 5 g. There were significant interaction effects between protein and lipid levels on final body weight, weight gain, and feed conversion ratio. The dietary protein levels affected weight gain and daily weight gain, while the dietary lipid levels affected length gain. The protein-sparing effect of lipids did not occur in the fingerling stage. Daily feed intake was affected by dietary protein levels but not lipid levels. Feed conversion ratios were lower with increased lipid levels; the lowest value was found at the protein level of 45%. The protein efficiency rates of fish were improved with increased dietary protein levels but were reduced with increased dietary lipids. Increasing dietary lipid levels of the fish resulted in higher body lipid deposition. Survival rates were high and were not affected by the experimental diets. The optimal levels of dietary protein and lipid for growth performance and feed utilization of the Mastacembelus favus fingerlings were 40% and 9%, respectively.
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protein, lipid, Mastacembelus favus, growth, feed utilization
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The Israeli Journal of Aquaculture - Bamidgeh
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