Billions of jellyfish, which covered an area of about 10 square miles of ocean, attacked an offshore salmon pen in Northern Ireland on Wednesday killing all the fish.

The Northern Salmon Co. Ltd. lost 100,000 salmon worth $2 million at two net pens located one mile off the coast of the Glens of Antrim, north of Belfast. The fish died from stings and stress.

Workers failed to rescue salmons on time as the mass of mauve stingers hindered their boats from reaching the pens.

The company's managing director, John Russell, said he had never seen such a massive jellyfish attack in his 30 years in the business. He described the scene as unprecedented and absolutely amazing.

Russell admitted they were helpless and could not do anything. He said the business may close if it does not get government assistance.