BACKGROUND: Mercury is a well-known toxic element present in seafood. Nevertheless some antioxidants, like selenium, as an integral component of the enzyme glutathione peroxidase, and alpha-tocopherol having a protective role against it, are present as well. The purpose of this study was to evaluate the levels of total mercury (Hg-T), organic mercury (Hg-Org), Se and alpha-tocopherol in some adult deep-water fi...