I vaguely remember a story a few years ago about a gigantic jellyfish swarm killing off thousands of fish at a fish farm.
Edit: Hm, happened in Northern Ireland. I thought maybe Japan. Ten square miles of jellyfish, 35 feet deep.
Quote:
The first attack was like a Biblical plague: Billions of purplish pelagia noctiluca, or mauve stingers, drifted over cages of salmon in Glenarm Bay and stung to death about 120,000 fish.
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Scientists Mystified by Jellyfish Attacks on Fish Farm