Abstract[1]This research carried out to evaluate the effect of different levels of dietary vitamin C premix and some indexes of growth, survival and resistance to some certain environmental factors (temperature, salinity) on the white fish larvae R. frisii kutum. Fish l
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Abstract[1]This research carried out to evaluate the effect of different levels of dietary vitamin C premix and some indexes of growth, survival and resistance to some certain environmental factors (temperature, salinity) on the white fish larvae R. frisii kutum. Fish larvae (weight 1 gr.) was prepared from bony fish reproduction and culture center was located in Sijuval City. Diet was containing four levels of 0, 200, 500 and 1000 mg per kg of vitamin C premix in three replications for 8 weeks for feeding of fish larvae were considered. 480 samples (an average weight of 1 g) were introduced to 12 plastic tubs (40 fish per tub). The fish were fed daily to 4% of body weight. The fish at the end of culture period was exposed under stress situation (31 oC) and salinity (14 ppt) and their survival was assessed. Results showed that the highest mean (±standard deviation) weight increased following in treatment of 1000mg per kg premix of vitamin C and least was in control treatment (without premix of vitamin C) but it was not significant. Study of growth indices, PBWI, SGR, FCR and survival rate in fish fed with premix of vitamin C 1000mg per Kg diet had significantly been higher than other treatments (P<0.05). Temperature and salinity stresses showed that fish fed with different levels of premix of vitamin C had more survival than fish fed no premix of vitamin C. Based on the results, it can be stated that premix vitamin C can plays an important role in enhancing growth performance and resistance to environment conditions (temperature, salinity) in R. frisii kutum larvae.* Corresponding authors; zeinab_shadehi@yahoo.com
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