Agricultural Research,Education and Extension Organization Iranian Scientific Fisheries Journal 1026-1354 27 5 2018 12 22 Assessment and comparison of heavy metal concentrations in muscle tissue of Oriental river prawn (Macrobrachium nipponense De Haan, 1849) in the Siah Darvishan River, Guilan province, Iran Assessment and comparison of heavy metal concentrations in muscle tissue of Oriental river prawn (Macrobrachium nipponense De Haan, 1849) in the Siah Darvishan River, Guilan province, Iran 49 59 117995 10.22092/isfj.2018.117995 FA M. Ettefaghdoost H. Alaf Noveirian Journal Article 2018 12 23 In this research, concentration of eleven elements (As, Fe, Hg, Zn, Pb, Se, Cd, Cr, Cu, Mn, Ni) in the muscle tissue of 40 Oriental river prawn (<em>Macrobrachium</em> <em>nipponense</em>) collected by bait trap from the Siah Darvishan River, Guilan province, Iran were determined using Varian Atomic absorption spectroscopy. The lowest and highest mean concentrations of metals were observed, as follows: Zinc 39.6-46.7, Copper 24.2-28.3, Iron 15.27-18.19, Manganese 3.36-3.82, Selenium 0.78-0.84, Arsenic 0.61-0.74, Lead 0.34-0.41, Nickel 0.34-0.41, Chromium 0.16-0.20, Cadmium 0.12-0.15 and Mercury 0.069-0.078 (μg g^–1d.w.), respectively. According to the results of this study, mean concentrations of all elements in the muscle tissue of Oriental river prawn, except for Arsenic and Manganese were less than threshold limit value recommended by FAO/WHO international standard. In this research, concentration of eleven elements (As, Fe, Hg, Zn, Pb, Se, Cd, Cr, Cu, Mn, Ni) in the muscle tissue of 40 Oriental river prawn (<em>Macrobrachium</em> <em>nipponense</em>) collected by bait trap from the Siah Darvishan River, Guilan province, Iran were determined using Varian Atomic absorption spectroscopy. The lowest and highest mean concentrations of metals were observed, as follows: Zinc 39.6-46.7, Copper 24.2-28.3, Iron 15.27-18.19, Manganese 3.36-3.82, Selenium 0.78-0.84, Arsenic 0.61-0.74, Lead 0.34-0.41, Nickel 0.34-0.41, Chromium 0.16-0.20, Cadmium 0.12-0.15 and Mercury 0.069-0.078 (μg g^–1d.w.), respectively. According to the results of this study, mean concentrations of all elements in the muscle tissue of Oriental river prawn, except for Arsenic and Manganese were less than threshold limit value recommended by FAO/WHO international standard. https://isfj.areeo.ac.ir/article_117995_f7b3a69b38cb79b4c96b398e30f907ad.pdf