Jellyfish invasions of this magnitude are rare. Biologists at the plant could recall only three other similar events in the past 30 years.

The plant, which is designed to withstand the impact of a Boeing 747 jumbo jet, was shut down for two days because of the jellyfish invasion and to repair a leak that was discovered in another pump after the shutdown, Doug Andrews said.

Unfortunately many giant groupers were also killed with the jellyfish that were sucked into the power plants cooling system.

Re-posted from Palm Beach Post

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