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A zoomed-in image of the crown-of-thorns sea star.
Article

A Plague of Sea Stars

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a man snorkels above a reef while a woman in flippers sits on a boat
Timeline

Sunscreen in the Environment

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: Black corals often resemble bushes or trees. Their living tissue can be one of several colors. It’s the skeleton that is black.
Article

Black Corals of the Deep

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This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
Article

Ocean Acidification Excites Boring Sponges

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A pair of French Angelfish (Pomacanthus paru) swim off the coast of Brazil.
Photo

Pair of Angelfish

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A Coral Reef Watch satellite monitors the temperature of the world’s oceans.
Photo

Coral Reef Watch Satellite

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A close-up image of red coral polyps.
Audio

Star of the Reef: One Species at a Time

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Fish swim underwater amidst mangrove roots at Bocas del Toro, Panama.
Article

On the Trail of DNA in the Ocean

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A coral head in the Mesoamerican Reef has both bleached and living coral. The white sections are bleached and the brown parts still contain zooxanthellae, the symbiotic algae that provide food to their coral hosts.
Article

Coral Under Pressure: Monitoring Bleaching In Real Time

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Two coral trout swim on a reef in Fiji.
Article

Having Your Fish and Eating Them Too

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
Article

Coralline Algae: The Unsung Architects of Coral Reefs

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The staghorn coral is listed as Threatened under the U.S. Endangered Species Act. It is one of 22 coral species listed.
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Staghorn Coral

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