Improving water quality, growth performance, and modulating some stress physiological biomarkers in Cyprinus carpio using raw date nuclei as a zinc adsorbent agent

Abstract Adsorption of heavy metals by affordable adsorbents has recently become one the most often applied method for removing these from contaminated water. The purpose this study was to evaluate efficacy using raw date nuclei (RDN) as a natural and inexpensive adsorbent remove Zn ions water reduce its impact on quality, bioaccumulation levels in fish organs, growth performance, some physiological aspects common carp ( Cyprinus carpio ) under sublethal concentrations. Five experimental groups were examined eight weeks; CNT, control group rearing clean water; RDN 0 , Zn-contaminated 3 treated with g RDN/L; 4.5 6 RDN/L. Water quality measures monitored continuously manner without excreta or renewing results showed that concentration alone significantly elevated level antioxidant biomarkers (SOD, superoxide dismutase; GST, glutathione transferases; GPX, peroxidase; CAT, catalase MDA, malondialdehyde), declined increased Zn-accumulation organs (gills flesh) ammonia secretions ponds compared group. concentrations RDN-containing aquariums lower than RDN-free aquariums, removal polluted dependent dosage. Consequently, performance serum bio-indicators enhanced presence reared In conclusion, although caused toxicity C. at levels, treating dosage per liter effectively prevented oxidative stress harmful impacts exposure.