This study measured 22 metal and metalloid concentrations in Hypnea musciformis from the Bakkhali River estuary and Saint Martin's Island, Bangladesh and determined their potential impact on consumption. Student t-tests showed a significant variation in metal concentrations between the two sampling sites (p < 0.05). Mean concentrations of Co (2.49 ± 0.05 mg/kg), Fe (793.29 ± 11.76 mg/kg), Mn (368.72 ± 4.87 mg/kg), Pb (3.82 ± 0.02 mg/kg), V (11.23 ± 0.20 mg/kg) and Zn (16.60 ± 0.28 mg/kg) were higher in samples collected from the Bakkhali River estuary compared to Saint Martin's Island, while mean concentrations of Ca (484.18 ± 4.68 mg/kg), Cd (2.44 ± 0.03 mg/kg), Mg (2112.70 ± 17.80 mg/kg), Mo (1.57 ± 0.06 mg/kg), Sr (2377.57 ± 29.98 mg/kg), and Ti (258.27 ± 4.62 mg/kg) were higher in samples collected from Saint Martin's Island. Eight heavy metals (Pb, Cd, Zn, Cu, Ni, Mn, Cr, Fe) were used to assess potential health risks for adults, but no potential health risk was detected (HQ value>1). This study reveals positive Se-HBV for H. musciformis collected from both sampling sites, indicating no potential risks involved with Hg toxicity.

Department of Biotechnology and Genetic Engineering Noakhali Science and Technology University Nokhali 3814 Bangladesh

Department of Oceanography Noakhali Science and Technology University Nokha li 3814 Bangladesh

Marine Fisheries and Technology Station Bangladesh Fisheries Research Institute Cox's Bazar 4700 Bangladesh

School for Resource and Environmental Studies Dalhousie University Halifax Nova Scotia B3H 4R2 Canada

University of South Bohemia in Ceske Budejovice Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of Hydrogenases Research Institute of Fish Culture and Hydrobiology Zatisi 728 2 389 25 Vodnany Czech Republic; Department of Biotechnology and Genetic Engineering Noakhali Science and Technology University Nokhali 3814 Bangladesh

University of South Bohemia in Ceske Budejovice Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of Hydrogenases Research Institute of Fish Culture and Hydrobiology Zatisi 728 2 389 25 Vodnany Czech Republic; Department of Fisheries Biology and Aquatic Environment Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706 Bangladesh

University of South Bohemia in Ceske Budejovice Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of Hydrogenases Research Institute of Fish Culture and Hydrobiology Zatisi 728 2 389 25 Vodnany Czech Republic; Department of Oceanography Noakhali Science and Technology University Nokha li 3814 Bangladesh

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