Environmental pollutants in Baltic fish and other domestic fish PCDD F, PCB, PBDE, PFC and OT compounds

As an outcome of the EU FISH II project, information was produced about PCDD/F and PCB as well as PBDE levels in Baltic fish, domestic freshwater fish and farmed fish. Variations in the levels were studied by age and size of the fish as well as by species and areas. Analyses of the presence of perfluorinated compounds (PFC) and organotin compounds (OT) in muscles and liver were also carried out within the scope of the project. New data on the content of hazardous substances in fish were obtained for use in risk management. The 2009 results were compared with the results of the previous project conducted in 2002-2003. Analyses of PCDD/F and PCB levels in fish highlight the same species that have also previously been found to be susceptible to accumulation of these environmental toxins. Baltic herring, salmon and sea trout as well as river lamprey and now in this study also European flounder in Kotka area show levels of PCDD/F and PCB compounds exceeding the maximum stipulated limits. In Baltic fish, the median levels of dioxin equivalents in sprat, vendace, perch, pike, pike-perch, burbot and cod are not even half of the permitted maximum level, which is 4 pg/g of fresh weight. The comparison of the levels measured in 2002-2003 with the 2009 levels of PCDD/F and PCB as well as PBDE compounds shows that the mean levels have decreased in salmon and herring. The OT levels measured in the muscles of open sea fish were about one third lower than in the fish samples caught in 2005–2007. Dioxins and dioxin-like PCB compounds are still the worst contaminants in the Baltic Sea. The levels of PBDE, PFOS and OT were low, with a few exceptions. The Bothnian Sea and the fishing areas of Pori, Turku and Kotka took the lead in the contamination ranking, but the worst area was Vanhankaupunginlahti Bay of Helsinki, where both OT and PFOS levels give cause to recommend consumption restrictions, at least as far as large perch are concerned.FI; fi; efsafocalpoint@evira.f