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Effects of vitamins C and E - supplemented diet on hematological indices of rainbow trout Oncorhynchus mykiss juveniles at two different densities were investigated in a 6-week trial. Rainbow trout juveniles (initial body weight of 9.6 ± 0. 69 g) at two stocking densities of 50 and 100 fish per 50 liters were fed three diets containing the same level of protein and fat, but with different levels of the vitamins. Experimental diets included diet 1 without vitamins, diet 2 supplemented with 1500 mg/kg vitamin C and diet 3 with 600 mg/kg vitamin E. A total number of 1350 rainbow trout juveniles were devided in six treatments each with three replicates as T50(0) (density = 50, fed diet 1), T100(0) (density = 100, fed diet 1), T50(C) (density = 50, diet 2), T100(C) (density = 100, diet 2), T50(E) (density = 100, diet 3) and T100(E) (density = 100 diet 3). After a 6-week feeding, hemoglobin level, the number of red blood cells and sodium level were significantly higher in T100 treatments (P0.05). According to the results, supplementing the diet of rainbow trout with vitamins C and E enhances fish resistance to the stressful environment caused by stocking density.

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