assessment of vitamin c effect on body composition and some antioxidant enzyme activities in caspian brown trout fry (salmo trutta caspius)

نویسندگان

مریم خواجوی

کارشناس ارشد تکثیر و پرورش آبزیان دانشکدة علوم دریایی دانشگاه تربیت مدرس عبدالمحمد عابدیان کناری

استاد گروه تکثیر و پرورش آبزیان دانشکدة علوم دریایی دانشگاه تربیت مدرس عباس زمانی

استادیار گروه شیلات دانشکده منابع طبیعی و محیط زیست ،دانشگاه ملایر

چکیده

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 (salmo trutta caspius) for 6 weeks in triplicate. after 6 weeks, the findings of growth parameters and survival showed significant difference among groups (p< 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 (p>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 (p < 0.05), while other diets showed no significatnt diference between pre-stress and after stress (p > 0.05). the findings suggest that the 750 mg/kg vitamin c could be affected on growth and survival in caspian brown trout fty.

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شیلات

جلد ۶۸، شماره ۳، صفحات ۳۶۹-۳۸۲

کلمات کلیدی
[ ' i n o r d e r t o s t u d y o f v i t a m i n c e f f e c t o n b o d y c o m p o s i t i o n a n d a n t i o x i d a n t e n z y m e a c t i v i t i e s ' , ' i n c l u d i n g s u p e r o x i d e d i s m u t a s e a n d c a t a l a s e i n f i v e d i e t s c o n t a i n i n g d i f f e r e n t l e v e l s o f v i t a m i n c ( 0 ' , 5 0 , 2 5 0 , ' 7 5 0 a n d 1 5 0 0 m g v i t a m i n / k g d i e t ) h a d b e e n f e d b y c a s p i a n b r o w n t r o u t f r y ( s a l m o t r u t t a c a s p i u s ) f o r 6 w e e k s i n t r i p l i c a t e . a f t e r 6 w e e k s ' , ' t h e f i n d i n g s o f g r o w t h p a r a m e t e r s a n d s u r v i v a l s h o w e d s i g n i f i c a n t d i f f e r e n c e a m o n g g r o u p s ( p < 0 . 0 5 ) . t h e l o w e s t a m o u n t o f s g r ' , ' b w g a n d s u r v i v a l w a s o b s e r v e d i n c o n t r o l g r o u p w h i l e t h e g r o u p o f 7 5 0 m g / k g h a d t h e h i g h e s t a m o u n t o f x a 0 s g r ' , ' b w g a n d s u r v i v a l t h a n t h o s e f r o m o t h e r s . t h e v i t a m i n c c o n c e n t r a t i o n i n t i s s u e c o r r e l a t e d p o s i t i v e l y w i t h i n c r e a s i n g i t s l e v e l s i n d i e t s . t h e v i t a m i n c r e q u i r e m e n t s w e r e e s t i m a t e d t o b e 5 6 9 . 1 m g k g ' , ' 1 b a s e d o n b o d y w e i g h t g a i n . b o d y c o m p o s i t i o n i n c l u d i n g m o i s t u r e ' , ' a s h ' , ' f a t a n d p r o t e i n s h o w e d n o s i g n i f i c a n t d i f f e r e n c e a m o n g g r o u p s ( p > 0 / 0 5 ) . t h e e f f e c t o f c o n f i n e m e n t s t r e s s o n a n t i o x i d a n t e n z y m e s a c t i v i t y o f c o n t r o l d i e t w a s i n d i c a t e d a s i g t n i f i c a t i n c r e a s e i n a c t i v i t y a f t e r s t r e s s t h a n t h a t f r o m b e f o r e s t t r e s s ( p < 0 . 0 5 ) ' , ' w h i l e o t h e r d i e t s s h o w e d n o s i g n i f i c a t n t d i f e r e n c e b e t w e e n p r e ' , ' s t r e s s a n d a f t e r s t r e s s ( p > 0 . 0 5 ) . t h e f i n d i n g s s u g g e s t t h a t t h e 7 5 0 m g / k g v i t a m i n c c o u l d b e a f f e c t e d o n g r o w t h a n d s u r v i v a l i n c a s p i a n b r o w n t r o u t f t y . ' ]

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