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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.

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 ...

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.

The turquoise water of Hōnaunau Bay in Hawaii, an area popular with snorkelers and divers, is teeming with spiny creatures ...

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 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 ...

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.

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.

The twin had suffered shark bites on her hand and leg and was rushed to hospital to undergo emergency surgery. Once she was ...

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 ...

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 ...