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Feasibility of removal of dioxin and dioxin-like PCB's by intensive fishery of herring and sprat in the Baltic Sea

image of 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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Dioxin and dioxin like PCBs in herring and sprat

The concentrations of dioxins and dioxin-like PCBs (dlPCBs) in herring and sprat in the Baltic Sea are generally high compared to other nearby seas, e.g. the North Sea (Karl & Ruoff, 2007). In addition, there are large and distinct spatial differences within the Baltic Sea (Bignert et al., 2007). The underlying causes of these differences in dioxin levels in fish are currently unknown, however, likely explanations are differences in exposure from local sources and/or ecological factors, such as fish growth rate and prey availability (Peltonen et al., 2007). Dioxins and dl-PCBs are highly bioaccumulative and there is a strong correlation between dioxin levels in fish and age.

English

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