Feasibility of Removal of Dioxin and Dioxin-like PCB's by Intensive Fishery of Herring and Sprat in the Baltic Sea
In this report it is discussed and assessed whether it is feasible to reduce dioxin content of herring and sprat in the Baltic Sea by a period of intensified fishery in the region and if intensified fishery causes adverse environmental effects or affects the stocks of other species like cod, salmon and other pelagic species. The background is the present problems complying with the European Commission limit values for dioxins and dioxin-like PCBs in Fish from the Baltic Sea. Also flame retardants and other hazardous substances present an increasing quality problem for the fisheries sector.
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abundance acuspes age-groups amount of dioxin amount of PCDD/F-TEQ areas assessment atmospheric deposition Baltic ecosystem Baltic Sea Bignert Bothnian Bay Bothnian Sea bycatch calculated Casini caught Central Baltic Sea clupeid cod eggs cod stock concentration of dioxins contamination decrease demersal trawl depletion dioxin and dioxin-like dioxin content dioxin levels dioxin-like PCBs dl-PCB-TEQ pg/g ww ecosystem ecosystem effects environment environmental estimated Figure Finnish fish mortality rate fleet grey seals Gulf of Finland Gulf of Riga harbour porpoises HELCOM higher ICES impact intensified fishery intensive fishery Köster mainly marine Möllmann MSVPA PCB’s PCDD/F pelagic trawl pollution predation prey recent recruitment reduced remove dioxin ringed seals salmon scenarios sediments species sprat biomass sprat catches sprat fishery sprat fishing sprat populations sprat stock Sprattus Subdivisions Swedish Technical basis total amount toxic trap-net trawl fishery trawlers trend trophic cascade values vessels whole Baltic zooplankton