Document Type : Research Paper
Department of Fisheries, Faculty of Marine and Atmospheric Sciences and Technologies, University of Hormozgan, Bandar Abbas, Hormozgan, Iran
Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
To investigate the effect of dietary supplementation of L-carnitine on growth and carcass composition of Sobaity fry, an experiment was carried out on 240 pieces of Sobaity Seabream (Sparidentex hasta) averaged 3.01 ± 0.03 g in initial weight for 10 weeks. Experimental treatments consisted of four levels of 0, 500, 1000 and 1800 (control, L-C500, L-C1000 and L-C1800) mg L-carnitine per kg of diet, each with three replicates in a completely randomized design. During the experimental period, feeding was performed by hand and the fish were fed to satiation three times a day. At the end of the experimental period, bodycomposition including crude protein, crude fat, moisture and ash contents were analyzed. Significant differences in growth parameters such as final weight, FCR, SGR, PER, GR and BWI% was observed among treatments (P<0.05) and the highest performance level of 1,000 mg g L-carnitine per kg diet were determined. The results showed that the level of crude protein in L-C1000 treatment increased compared to the control group, and the difference was statistically significant (P<0.05). Carcass crude fat decreased in L-C500 and L-C1000 treatments compared to the control group, and the lowest was observed in L-C1000 treatment (P<0.05). Percentage of carcass moisture in L-C1000 treatment, and also the percentage of carcass ash in all treatments increased compared to the control group and the difference was statistically significant (P<0.05). According to the results of this study, the level of 1000 mg L-carnitine per kg of diet has positive effects on growth and chemical composition of Sobaity fry carcass.