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¹ University of Guilan, Department of Biology, Faculty of Science, Rasht, Iran
² University of Guilan, Basin Research Center, Department of Marine Sciences, Rasht, Iran DOI : 10.4194/TRJFAS19548 Viewed : 1445 - Downloaded : 1325 The present study investigated the lethal and semi-lethal effects of silver nanocolloid and copper (I) oxide nanoparticles on the expression of HSP70 and glutathione S-transferase (GST) in the gill, liver, and serum of the Caspian kutum fry (Rutilus kutum). Fish were exposed to different concentrations of silver nanocolloid (0.05, 0.35, and 0.7 of LC₅₀) and copper (I) oxide nanoparticles (0.25 and 0.5 of LC₅₀). The results showed a high expression of the HSP70 gene on the 7^th and 21^st days of exposure to silver nanocolloid and copper (I) oxide nanoparticles. Significant changes in GST levels were observed under the influence of silver nanocolloid in the gills and serum. In conclusion, variations of the HSP70 gene expression and GST activity show that the presence of nanoparticles could be affecting the antioxidant system in the fish body; indicating that their excessive influx brings disruptive danger to aquatic health. Keywords : Nanoparticles Stress Caspian kutum HSP GST