Fish farmers in Scotland are permitted to use 16 "toxic" chemicals to kill parasites and fungi, control infections and anaesthetise fish.
Fish farming companies are being allowed to breach environmental limits and pollute lochs because of export problems caused by Brexit.
Pollution of Scotland’s lochs from a toxic fish farm pesticide has leapt 72 per cent in a year, according to the Scottish Environment Protection Agency
Scotland's salmon farming industry is planning to start using a toxic pesticide that has been banned in terrestrial agriculture because of dangers to bees, campaigners are warning.
The number of annual inspections of sites regulated by the Scottish Environment Protection Agency fell by a quarter over the last five years, prompting concerns about pollution.
The Scottish Government defied concerted pleas by salmon farming multinationals to keep photos of diseased and damaged fish secret, according to internal emails.
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.
At least nine million fish have been killed by diseases, botched treatments, poor handling and other problems at salmon farms around Scotland since 2016.
A leading Scottish salmon farming company has stopped branding its business as “sustainable”, according to the UK advertising watchdog.