Abstract
The induction of cytochrome P450IA1 was detected in freshwater fish liver using 7-ethoxyresorufin- O-deethylase activity (EROD). Investigations took place in the river Durance in the south-east of France and revealed a strong induction downstream a chemical plant. This induction differed between the three species studied. The species Barbus barbus was more sensitive to the pollution. This might be due to the benthic feeding behaviour ofthat fish. The induction increased from February to October which was probably a concentration effect caused by the drastic drought that occurred in France in 1989.
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