Over one in ten of Scotland’s fish farms have been rated as “unsatisfactory" by the Scottish Government’s environmental watchdog.
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
A salmon farming company has been reprimanded for feeding a toxic pesticide to fish twice as often as permitted and breaching a safety limit.
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.
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.
A £3 billion fish farming multinational in Scotland has been officially reprimanded for animal welfare failures after more than 700,000 caged salmon died over three months.