Dioxins and Polychlorinated Biphenyls

Fish can also contain other organic pollutants, such as PCBs and dioxins. Whereas mercury accumulates in the muscles of larger predatory fish, PCBs and dioxins are found in the fatty tissues of fish. Most human exposure to PCBs and dioxins comes from dietary sources because they accumulate in the lipid fractions of meat, fish, milk and milk products, eggs, grains, and oils.

Table 5 Concentrations of methylmercury in surveyed fish in the United Kingdom


Methylmercury (mg/kg)


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