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In chemistry it is known that when you mix an oil and water, the oil layer will tend to contain more of the oil soluble materials and the aqueous layer will tend to contain more of the water soluble materials. This known as partitioning. The ratio of the concentration in the upper and lower layers is known as the partition co-efficient, and it is a major factor in designing useful drugs.

OP suggests that oil soluble chlorinated materials such as toxic PCBs are expected to concentrate in fat tissue including that from fish.

You will want to examine to data carefully to decide which fish and grown where. As rivers like the Hudson River are known to have PCB contamination, fresh water fish from some parts of the Hudson are suspect. But salt water fish would seem to be less of a concern.
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