The amount of salmon killed by diseases and other problems at fish farms has reached record levels, with death rates quadrupling over the last 18 years.
Ten lochs across Scotland have been polluted by a toxic pesticide used by fish farms to control fungus, parasites and disease.
Rules on the use of toxic pesticides by the fish farming industry have been relaxed because of the coronavirus emergency, prompting fears for marine wildlife.
The Scottish salmon farming industry has been accused of taking advantage of the coronavirus emergency to “sidestep” environmental regulation.
Nearly 200 fish farms are allowed to use a carcinogenic chemical called formaldehyde which is used to embalm corpses.
The multinational salmon farming industry has been pushing behind the scenes for environmental limits on a toxic pesticide to be 100 times weaker than government regulators recommend.