Diadema, a Caribbean sea urchin, has suffered two massive dieoffs in recent decades. Florida scientists are trying to help them thrive and save our coral reefs.

In the denuded Florida Keys, considerable effort has been extended to document the decline of coral, fish, seagrass and manatees, but only a handful of widescale sea urchin surveys have been ...

Spotting one on the Florida reef tract is a good sign that nearby corals are doing OK. These days, long-spined sea urchins are known as the gardeners of the sea.

Scientists investigating a widespread and sudden die-off of long-spined sea urchins that spread nonstop for much of 2022 across the Caribbean and Florida have identified a tiny parasite as the killer.

A sea urchin infected by a disease spread by a microscopic single-celled organism called a Philaster apodigitiformis, at right, and a healthy sea urchin, at left, are seen in St John in April 2022 ...

South of Tampa Bay, in Florida, wedged between a quiet neighborhood and a mangrove forest, custom-designed aquariums are home to thousands of sea-urchin larvae that tumble and drift through the water.

In this photo provided by researchers, University of South Florida researchers Mya Breitbart and Isabella Ritchie work with a sea urchin during a ciliate exposure experiment in the University of ...

That event had killed off 98% of the long-spined sea urchin population in the region, scientists said. The cause for the early '80s die-off has yet to be determined.

Marine scientists have discovered the source of a mysterious outbreak that killed sea urchins in droves in the Caribbean Sea. The massive die-off was caused by a single-celled parasite.

Spotting one on the Florida reef tract is a good sign that nearby corals are doing OK. Sea urchin die-off threatens reefs from Florida to Caribbean. Scientists hope to revive them ...