Effect of polyphenol pre-treatment on mucus immune indices of common carp Cyprinus carpio in exposed to silver nanoparticles

Due to the increasing use of nanoparticles and also dietary supplements in aquaculture industry, the present study was conducted to investigate the effects of dietary supplementation and nanoparticles by investigating polyphenol pre-treatment on the immune indices of common carp skin mucus (Cyprinus carpio) in exposed to silver nanoparticles. 230 fish with mean weight of 15.6±0.4 g were distributed in five treatments without dietary supplementation and no exposure to silver nanoparticles (negative control), without dietary supplementation and exposure to silver nanoparticles (positive control), Fed with 0.05, 0.1 and 0.2 g of polyphenol/kg of food for 60 days then exposure to 50% lethal concentration of silver nanoparticles for 14 days. The results showed that in treatments fed different concentrations of polyphenol diet during exposure to silver nanoparticles lysozyme activity and soluble protein, total mucosal immunoglobulin level were significantly increased (p < 0.05). In general, silver nanoparticles had adverse effects on common carp. The 0.05 g of dietary polyphenol supplementation had more positive effects on physiological parameters of common carp in exposed to silver nanoparticles.