Norwegian prices topped £5 per kilo in March.

Pollution claims from angling organisation

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The report claims to have analysed the levels of sea lice treatment chemical residues - which are used by salmon farmers - in the sea-beds of lochs across Scotland.

Information was obtained under Freedom of Information from the Scottish Environment Protection Agency (Sepa). S&TA claims its findings were "worrying" for wild fish stocks.

The association added that it was also concerned about the impact of juvenile sea lice from the fish farms on emigrating wild salmon and sea trout.

It maintains that the chemicals used to treat the lice are harmful to the wider environmental community.

SSPO dispute the report. Scott Landsburgh SSPO chief executive told BBC News: “This is yet another misleading report from the Salmon & Trout Association which takes raw data out of context and speculates on potential impacts to suit its own purposes.

"It is one of an increasing list of highly contentious claims by a campaigner based in England against legitimate users of Scotland's water resources."