The footage was taken earlier this month at four farms owned by Mowi by Scottish Salmon Watch (SSW) which submitted a complaint to Police Scotland’s Wildlife Crime Unit.

The underwater videos – shot by SSW director and activist Don Staniford – show lice infested salmon and dead fish in cages where fish are farmed by the Norwegian firm, prompting critics to raise fresh concerns about animal welfare and oversight of the farmed salmon industry.

Mowi said in response, however, that SSW’s footage shows “isolated examples” and pointed out that it was cleared in March this year by RSPCA Assured after similar claims were made by critics. The firm accused Staniford of being selective and “unfair” with his secret filming.

The full story is on The Ferret website