Abstract
1. A marked level of mixed-function oxygenase (MFO) enzyme induction was observed in kidney but not in liver tissues of winter flounder collected at the site of a spill of No. 2 fuel oil in Newfoundland. 2. A number of MFO-linked, electron transport components including cytochrome P 450, cytochrome P 450 reductase and cytochrome b 5 reductase were also slightly elevated in kidney tissues of fish at the oiled site. 3. The results obtained in this particular field trial demonstrate that reliance on the measurement of liver MFO parameters alone could lead to false negatives in biological monitoring programs. 4. The study also indicates that the exclusive use of liver tissues to investigate the induction potential of various chemicals should be avoided.
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