Campaigners call for action as jellyfish threaten Scottish salmon farms

String jellyfish have caused the death of more than 200,000 farmed salmon in Scotland.
Photograph: Alf Jacob Nilsen/Alamy

A jellyfish species that has been wreaking havoc on Norway’s salmon industry has made its way to Scotland, causing significant damage and prompting calls for urgent action.

The string jellyfish has killed millions of salmon in Norwegian sea farms with officials urging an extermination of affected stocks.