A 10 weeks trial was performed to investigate how different carbon sources (sugar beet molasses: SBM + BFT, sugar: S + BFT, corn starch: CS + BFT) along with control affect welfare status of common carp ( Cyprinus carpio L.) fingerlings in biofloc-based tanks. Three hundred healthy fingerlings (22.5 0.2 g) were randomly distributed in 12 tanks (70 L) at a density of 8.02 kg/m 3 (25 fish/tank). The fish in BFT treat- ments fed only 75% feeding rate of control. At the end of the experiment no differ- ences were seen between the groups in case of growth performance, but the fish reared in CS + BFT had a significant lower food conversion ratio compared with the others ( p < .05). Different carbon sources did not affect on haematological parame- ters ( p > .05). Total serum protein and antibody concentration differed in treat- ments, and the highest values were found in S + BFT and CS + BFT treatments ( p < .05). No significant differences were observed in case of lysozyme, superoxide dismutase and complement activity in treatments ( p > .05), whereas the fish in BFT treatments showed a significant higher total antioxidant capacity and lower glu- tathione peroxidase than the control ( p < .05). Different carbon sources resulted in no change in goblet and kupffer cells in intestine and liver respectively. The highest relative percentage survival was obtained in the CS + BFT and S + BFT (50%) in com- parison with SBM + BFT (20%) treatment. The results obtained in this experiment, suggest that corn starch improves immune response, diseases resistance and histol- ogy of digestive and respiratory systems in carp fingerlings when used as a carbon source in zero water exchange system.
کلید واژگان :antioxidative , biofloc, common carp, different carbon sources, immunity
ارزش ریالی : 600000 ریال
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