Then it began swamping the Black Sea's prized beaches ... forced the closing of beaches in Hawaii last month and swarms of jellyfish blocked the intake valves at power plants in Sweden, Israel ...

“I think they’re just mesmerizing,” Jennie Janssen, the assistant curator who oversees the care of the aquarium’s jellyfish ... species decimated Black Sea fisheries.

Under the heading of 'Review of Jellyfish Blooms in the Mediterranean and Black Sea', the reports points ... a 26 square kilometres swarm of the jellyfish wiped out a 100,000 fish salmon farm ...

The phenomenon is attributed to El Niño currents Beaches near the city of Osorno in southern Chile have closed due to swarms of jellyfish populating the shores. At least 40 people have reported ...

Every summer more and more jellyfish are being washed up onto the shorelines around Wales. During Springwatch 2009, Simon King's team sought out jellyfish swarms but weren't lucky enough to find ...

Hundreds of jellyfish threaten to shut down an Israeli power plant every summer. In recent years, several other power plants around the world have faced the same threat. More from Science Hundreds ...