Abstract

Three feral fish species captured downstream to a Finnish pulp and paper mill using chlorine bleaching showed statistically significant increases in liver EROD (7-ethoxyresorufin deethylase) activity extending at least up to 13 km from the sewer compared to upstream situation. Rainbow trout and whitefish caged on the same lake area for 3 weeks showed similar patterns of induction. A simulated effluent as well as dehydroabietic acid and tetrachloroguaiacol displayed a very low capacity or were totally devoid of capacity to induce EROD in trout liver.

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