The Nifes study showed that farmed salmon had lower levels of most environmental pollutants than wild salmon, including dioxins, PCBs and pesticides.

Swedish salmon sales 'breached EU ban' over dioxins

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The BBC News report that the ban does not apply to Baltic salmon sold to domestic consumers in Sweden, Finland and Latvia. But the sellers are required to give advice about safe limits for consumption, set by the EU.

Dioxins found in Baltic herring and salmon prompted the EU ban in 2002.

A French firm imported 103 tonnes of Swedish salmon, but no longer does so.

Pecheries Nordiques told the AFP news agency that its tests had found no problems with the fish, imported in 2011 and 2012. "Nobody told us it was illegal," chief executive Francois Agussol said.

Jan Sjoegren of Sweden's National Food Agency told the BBC that Baltic salmon had also been exported illegally to Denmark and the Netherlands from Sweden.

The agency has alerted the European Commission, which deals with national food safety authorities.