The density of jellyfish stopped workers from reaching cages

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A Northern Salmon spokesman said last week's attack could cost more than £1m.

Billions of small jellyfish, known as Mauve Stingers, flooded into the cages about a mile into the Irish Sea, off Glenarm Bay and Cushendun.

The jellyfish covered an area of up to 10 square miles and a depth of 35 feet. Rescuers tried to reach the cages but the density of fish made it impossible.

Managing director John Russell said he had never seen anything like this in 30 years in the business.

It could take at least two years for the firm to recover

"It's a disaster for this company - you cannot legislate for something like this."

He says the firm could take at least two years to recover.

The company has some high-profile clients, with Irish chef Richard Corrigan serving Glenarm salmon to the Queen on her 80th birthday last year as part of the BBC's Great British Menu programme.

The Department of Agriculture's fisheries division has carried out a full investigation, and talks with NI Agriculture Minister Michelle Gildernew have taken place to try to rescue the farm and save the jobs of 12 staff.