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Abstract
The PCB levels of 4 fish species which were collected in the French part of Lake Leman were determined. The factors of intra- and extra-species variations of contamination and the risks in reproduction were studied. Char eggs contained PCB levels between 14 to 22 ppm on a lipid basis (0.17 to 0.22 ppm on a fresh weight basis). The very high sensitivity of the Char is a good argument to explain the degree of mortality in Char eggs related to PCB content. PCB levels in lake Leman fish are comparatively high and therefore, the contamination of the ecosystem is certainly not negligible. For that reason the following studies are under investigation: contamination in other trophic levels; the fate of PCB in the ecosystem; sources; risks for Char reproduction. (JMT)
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