نوع مقاله : مقاله پژوهشی
نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Six diets supplemented with 0, 100, 200, 400, 800, and 1600mg/kg L-Ascorbyl-2- Polyphosphate (APP) as vitamin C, were fed to juvenile beluga sturgeon in three replicates for 16 weeks. Fifty five fish with an average weight 38.1±0.5g were distributed to each tank after adaptation to the experimental diets. Most of the growth performance indices at week 4 indicated significant differences (P<0.05), but there was no difference at week 8 (P>0.05), except in CF and PER (P<0.05). In addition, there were significant differences (P<0.05) in the growth indices except for BWI, PER, and FCR at week 12. At week 16th there were significant differences in mean weight, CF, and SGR (P<0.05). The comparison between growth performance during the trial showed significant differences in mean weight, CF, and SGR among the treatments (P<0.05), but there was no difference in HSI at the middle and the end of the experiment (P>0.05). The survival was affected by dietary treatment at week 4 (P<0.05), but during the whole experimental period, the highest mortality was observed in fish fed by diet without vitamin C, but the difference was not significant (P>0.05). No deficiency sign was observed during the trial. Results of this study indicated that vitamin C can have remarkable effects on growth indices in different growth periods. Therefore, regarding the effects of vitamin C on the growth indices and in the fish weight range used in this study, 100-200mg/kg vitamin C (APP) can be considered as the optimum level for rearing the fish.
کلیدواژهها [English]
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