One of the world's largest fish farm companies, Marine Harvest, has voluntarily agreed to much tougher limits on its pesticides use and seal killing by joining a strict new environment scheme.
Marine Harvest will join the Aquaculture Stewardship council, a new accreditation scheme championed by WWF, after coming under repeated attack for heavy use of toxic chemicals, seal-killing and major outbreaks of sea lice and salmon diseases.
The Norwegian-owned company, which grows 25 percent of all Scotland's farmed salmon, has promised to put all its UK fish farms through ASC accreditation by the end of this decade in what supporters of the scheme believes could transform the environmental sustainability of salmon farming.