A venture called the Purple Urchin Ranching Project is helping to rejuvenate California’s kelp forests by ranching sea urchins for food. A heat wave in 2014 and 2015 disrupted ecosystems in California ...

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.

Since last year, long-spined sea urchins in the Caribbean Sea have been dropping dead with no known cause. Now, scientists may finally have found the culprit. The species, called Diadema antillarum, ...

ST. PETERSBURG, Fla. — If you've gone snorkeling or visited the touch tank at your local aquarium, you've likely seen a sea urchin. The black, spiny creatures play a critical role to the health of ...

NEW YORK — Last year, sea urchins in the Caribbean started getting sick — shedding their spines, dying off and throwing reef ecosystems into chaos. Now, scientists think they’ve caught the killer in ...

When Mya Breitbart heard that something was killing off sea urchins en masse, she thought: Oh no, not again. The long-spined sea urchin—a fist-size ball of black defensive spines—is a crucial and ...