Immense jellyfish “blooms” forced the closing of beaches in Hawaii last month and swarms of jellyfish blocked the intake valves at power plants in Sweden, Israel and the United Kingdom.

An army of spotted jellyfish created an ethereal sight, lighting up the water on recent fall nights when they made an unseasonable appearance near Kagoshima Bay. Several hundred spotted jellyfish ...

TikTok user @lil_vb_ was filming at Manly Beach, Sydney, as lifeguards instructed swimmers to exit the sea as a swarm of blue ...

Large blooms of moon jellyfish are being seen from the River Derwent to halfway up Tasmania's east coast. A leading marine scientist has said "an incredible sequence of events" has led to the ...

Local fisheries collapsed. In other parts of the world, swarms of jellyfish have menaced swimmers and clogged fishing nets. In 2006, beaches in Italy and Spain were closed because of a bloom of ...

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 ...

Sam Wells believes we may have been too quick to jump to conclusions about the proliferation of jellyfish blooms ...

Moon jellyfish swarm in the cool autumnal waters of a fjord outside Tromsø in northern Norway illuminated by the aurora borealis. Sheltering his equipment in a self-made waterproof housing, Audun used ...

During Springwatch 2009, Simon King's team sought out jellyfish swarms but weren't lucky enough to find any during their two week stint on Anglesey. The only location which did have some was ...