Chilean salmon farmer Blumar has been ordered to hand authorities an urgent action plan in case 2,900 metric tons of dead fish trapped in the wreckage of a sunken production site starts to affect the environment in Chile's Los Lagos region.
An early warning plan is being demanded by officials at Chile's Environmental Superintendency.
It is estimated that 771,405 fish died when 16 cages sank after stormy weather battered the site in late June.
