The assessment of organic mercury in Baltic fish by use of an in vitro digestion model

► Fish muscle tissue influences Hgorg bioaccessibility during in vitro digestion. ► Organic mercury bioaccessibility depends on the species of fish. ► Bioaccessibility is a factor in risk assessment of Hgorg from fish consumption. ► Bioaccessibility decreases as [Hgorg] increases in flounder, turbot and cod muscles. ► Bioaccessibility increases as [Hgorg] increases in herring and perch muscles.