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PCBs are most commonly found in freshwater fish that live in flax inland lakes flax such as bluefish, lake trout and smelt. The contamination of fish varies in each region of the United States. More information about a specific region can be obtained at the following web site : http://www.epa.gov/waterscience/fish/states.htm. Unfortunately, farmed (but not wild) salmon is high in PCBs. This is unfortunate because salmon is otherwise an excellent source of fish oil and quite low in mercury. The reason for the high levels in farmed salmon appears to be that they are fed fish that are high in PCBs. Supposedly, flax the salmon farming industry is changing this practice so this will hopefully be less of a problem in the future. Lean ocean fish such as cod, flounder and haddock tend to be the lowest in PCBs. Fatty fish caught locally tend to have high levels as they come from polluted water and the PCBs primarily accumulate in fat.
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