en عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: Heavy metals are considered as pollutants polluting aquatic ecosystems because of their toxic effects and bioaccumulation in organisms. They can cause chronic poisoning when ingested by human. The present study was conducted to determine the concentration of heavy metals, mercury (Hg), lead (Pb), cadmium (Cd), and chromium (Cr) in the muscle tissue of Liza abu and Brachirus orientalis fish in Mahshahr, and also, to estimate the risk of muscle consumption of these fish.<br> Methods: Forty samples of both fish species were randomly selected and after preparation and extraction and digestion processes, the metals were measured using ICP-OES Agilent Model 5100.<br> Results: The mean concentrations of Hg, Pb, Cd, and Cr in the muscle tissue of the Liza abu fish were 0.616 &plusmn; 0.383, 1.227 &plusmn; 1.77, 0.076 &plusmn; 0.030, and 0.567 &plusmn; 0.267 mg/kg dry weight, and in the muscle tissue of the Brachirus orientalis fish were 0.846 &plusmn; 0.659, 0.515 &plusmn; 1.245, 0.061 &plusmn; 0.047, and 0.586 &plusmn; 0.548 mg/kg dry weight, respectively. HI for Liza abu and Brachirus orientalis was 0.025 and 0.336, respectively.<br> Conclusion: According to the results of this study, the concentrations of Hg and Cr in the muscle tissue of Liza abu and Brachirus orientalis were slightly higher than some global standards such as the World Health Organization (WHO) and Food and Agriculture Organization (FAO). HQ index was below 1 for two fish species, meaning that there was no non-carcinogenic risk. In all samples analyzed, carcinogenic risk Cr was slightly above the permissible limit of 1&times;10-4 to 1&times;10-6 ،other metals were in this range.</div> Fishes, Hg, Cr, HI, CR 157 164 http://ehemj.com/browse.php?a_code=A-10-1-248&slc_lang=en&sid=1 Afsaneh Azadeh a.azade.1372@gmail.com 100319475328460010311 100319475328460010311 No Student Research Committee, Department of Environmental Health Engineering, School of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Afshin Takdastan afshin_ir@yahoo.com 100319475328460010312 100319475328460010312 Yes Corresponding author: Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Nematollah Jaafarzadeh Haghighi Fard n.jaafarzade@yahoo.com 100319475328460010313 100319475328460010313 No Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Ali Akbar Babaei babaei-a@ajums.ac.ir 100319475328460010314 100319475328460010314 No Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Soleyman Alivand 100319475328460010315 100319475328460010315 No Department of Biostatistics and Epidemiology, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran