A floating, bell-shaped jellyfish and a bright blue fish
Jellyfish under a darkening sky
A large jellyfish backlit in greenish waters
A pulsing jellyfish moves through a lagoon
Close-up of a reddish-orange jellyfish
A diver taking a close look at a large jellyfish
A colorful, bioluminescent comb jelly
Close-up of a jellyfish’s white tentacles
A crab carrying a jellyfish across the seafloor
Small crab atop a much larger purple-striped jellyfish
A crab clinging to a floating jellyfish
Jellyfish in water
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Mosaic Jellyfish

A mosaic jellyfish floats serenely in the waters of the Coral Sea, about 100 nautical miles from Cairns, Australia. Jellyfish are ubiquitous in the Earth’s oceans. They can thrive in warm water and cold, along coastlines or out in the deep. Their bodies are about 95 percent water. And though they have n...

Photograph by Melissa Fiene, My Shot

Jellyfish

Jellyfish aren’t fish but invertebrates, animals that lack backbones and even brains. Yet 30,000-odd species do far more than survive—they thrive in ocean waters the world over.

October 29, 2009

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