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The 2006 european directive on polychlorodibenzodioxins and related compounds infoodstuffs prompted in France a nationwide monitoring study of freshwater fishcontamination by these compounds. A database covering about 300 sites (2848 samples of 36fish species) was obtained from this study. This database was used to explore congenerpattern distributions, in order to identify typical sources and the impact ofbiotransformation on these sources. Fish ecological traits and fish size are the mainfactors explaining the overall PCB contamination in the two pre-identified categories ofspecies (high or low propensity to accumulate hydrophobic compounds). Lipid content isalso an influencing factor, but its relationship to other factors remains uncertain.Species show distinct congener patterns, related more to their physiology than toecological traits. Spatial patterns were studied on selected sites having more than fiveindividuals analysed – either chub (Squalius cephalus) or barbel(Barbus barbus), the most widespread species in the database –. Weidentified six patterns, which mainly differed in the respective proportions of congenerspotentially biotransformed by fish. No connection to typical sources, e.g.technical mixtures, was identified. These patterns instead represent an ageingpath of the initial mixtures; they could be used for setting remediation priorities

Nationwide PCB congener pattern analysis in freshwater fish samples in France