Journal of Fisheries 2008-5729 68 3 2015 09 23 Assessment of vitamin C effect on body composition and some antioxidant enzyme activities in Caspian brown trout fry (Salmo trutta caspius) Assessment of vitamin C effect on body composition and some antioxidant enzyme activities in Caspian brown trout fry (Salmo trutta caspius) 369 382 56117 10.22059/jfisheries.2015.56117 FA Maryam Khajavi The graduated M.Sc in Fisheries from Marine Sciences Faculty of Tarbiat Modares University, Noor, Iran Abdolmohammad Abedian Kenari The Professor in Fisheries Department of Marine Sciences Faculty of Tarbiat Modares University,Noor, Iran Abas Zamani Journal Article 2015 02 04    In order to study of vitamin C effect on body composition and antioxidant enzyme activities, including superoxide dismutase and catalase in five diets containing different levels of vitamin C (0, 50, 250, 750and 1500mg vitamin/kg diet) had been fed by Caspian brown trout fry (<em>Salmo trutta caspius</em>) for 6 weeks in triplicate. After 6 weeks, the findings of growth parameters and survival showed significant difference among groups (<em>P</em>< 0.05). The lowest amount of SGR, BWG and survival was observed in control group while the group of 750 mg/kg had the highest amount of  SGR, BWG and survival than those from others. The vitamin C concentration in tissue correlated positively with increasing its levels in diets. The vitamin C requirements were estimated to be 569.1 mg kg^-1 based on body weight gain. Body composition including moisture, ash, fat and protein showed no significant difference among groups (<em>P</em>>0/05). The effect of confinement stress on antioxidant enzymes activity of control diet was indicated a sigtnificat increase in activity after stress than that from before sttress (<em>P</em> < 0.05), While other diets showed no significatnt diference between pre-stress and after stress (<em>P</em> > 0.05). The findings suggest that the 750 mg/kg vitamin C could be affected on growth and survival in caspian brown trout fty. <strong> </strong>        In order to study of vitamin C effect on body composition and antioxidant enzyme activities, including superoxide dismutase and catalase in five diets containing different levels of vitamin C (0, 50, 250, 750and 1500mg vitamin/kg diet) had been fed by Caspian brown trout fry (<em>Salmo trutta caspius</em>) for 6 weeks in triplicate. After 6 weeks, the findings of growth parameters and survival showed significant difference among groups (<em>P</em>< 0.05). The lowest amount of SGR, BWG and survival was observed in control group while the group of 750 mg/kg had the highest amount of  SGR, BWG and survival than those from others. The vitamin C concentration in tissue correlated positively with increasing its levels in diets. The vitamin C requirements were estimated to be 569.1 mg kg^-1 based on body weight gain. Body composition including moisture, ash, fat and protein showed no significant difference among groups (<em>P</em>>0/05). The effect of confinement stress on antioxidant enzymes activity of control diet was indicated a sigtnificat increase in activity after stress than that from before sttress (<em>P</em> < 0.05), While other diets showed no significatnt diference between pre-stress and after stress (<em>P</em> > 0.05). The findings suggest that the 750 mg/kg vitamin C could be affected on growth and survival in caspian brown trout fty. <strong> </strong>     https://jfisheries.ut.ac.ir/article_56117_6a2aa778967ff487b9fe81d485795b85.pdf