Oil and PCB interactions on the uptake and excretion in midges.

Polychlor inated biphenyls (PCBs) are highly pers is tent global contaminants with a broad range of long-term environmental and health ef fects (Fishbein 1974). Body burdens of many chlor inated aryl compounds in aquatic organisms accumulate by combinations of passive absorption d i r ec t l y from water or by pa r t i t i on ing in to l i p i ds of foods. Both routes have been shown to contr ibute s i g n i f i c a n t l y to levels found in f ish (S ta l l ing and Mayer 1972; Hansen et a l . 1976).