The effects of different levels of vitamins C and E on the growth indices in rainbow trout (Oncorhynchus mykiss)

This study was conducted to assay the effects of different levels of dietary vitamins C and E on growth indices and survival of rainbow trout (Oncorhynchus mykiss) in pond culture of Marzan abad (Kelardasht-Mazandaran Province) from December 2011 to February 2011. Seven diets were supplemented. 300 fish with the average weight of 17 g were introduced to ponds for 60 days. The results showed that the highest and the lowest weight gain were in fish fed with diet containing 50 mg/kg vitamin C and E and 0 mg/kg vitamin C and E, respectively. The highest and the lowest Feed Conversion Ratio (FCR) were measured in control and diet 50 mg/kg vitamin C and E. There is a significant different in their treatments (P<0.05). Also, the lowest and highest amount of Weight Gain (WG), Specific Growth Rate (SGR), Protein Efficiency Ratio (PER), Condition Factor (CF) was found in control and treatment 50 mg/kg vitamin C and E, respectively. In conclusion vitamin C and have an important role in enhancement of growth performance and feed efficiency of rainbow trout.