We summarized available data concerning contamination of the Czech part of the Elbe River by mercury and assessed the potential risks to humans connected with the consumption of contaminated fish. Total mercury concentrations were evaluated in dorsal muscle of chub (Squalius cephalus) and bream (Abramis brama) that were collected at 11 sampling sites in the period from 1991 to 2016. Significant differences among sites were found for both species. The highest contamination was observed near the non-ferrous Kovohute metal works at Celakovice and also downstream from the Spolana chemical plant at Neratovice. A significant decline in contamination with time (concentrations decreasing from 1.65 to 0.22 mg kg-1; p = 0.004) was revealed in chub downstream from the Spolana plant. Calculated hazard indices (HIs) were below 1, therefore, adverse health effects on the general Czech population connected with the consumption of fish from the Elbe River were not expected.

Department of Animal Protection and Welfare and Veterinary Public Health Faculty of Veterinary Hygiene and Ecology University of Veterinary and Pharmaceutical Sciences Brno Palackeho tr 1946 1 612 42 Brno Czech Republic

Institute of Biostatistics and Analyses Faculty of Medicine Masaryk University Kamenice 126 3 625 00 Brno Czech Republic

RECETOX Faculty of Science Masaryk University Kamenice 753 5 625 00 Brno Czech Republic

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Do the total mercury concentrations detected in fish from Czech ponds represent a risk for consumers?