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A submersible’s robotic arm collects gold coral in the Hawaiian Islands. Similar specimens have been dated at more than 2,700 years old.
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Collecting Gold Coral from the Deep Sea

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An unidentified moray eel held in researcher's hands.
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A Baby Moray Eel, or a Really Small Adult?

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Dr. Valerie Paul, director of the Smithsonian Marine Station at Fort Pierce, Fla., examines tropical seaweeds on northwestern Guam’s coral reefs.
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Diving in Guam

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A purple hard coral releases bundles of pink eggs glued together with sperm.
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Coral Spawning

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Grey reef sharks are among the most versatile and tough predators on a Pacific coral reef, but they are also among the most vulnerable species, as they are threatened by wasteful fishing practices like shark finning.
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Grey Reef Shark in the Line Islands

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Compare the healthy coral on the left with the bleached coral on the right.
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Bleached Corals, Pacific Ocean

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A diver on the reef near Moorea collects samples.
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Research Diver in Moorea

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Scientist Martha Nizinski examines a sample of the deep-sea coral Lophelia pertusa, collected 600-m (1,969-ft) deep off the coast of the southeastern United States.
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Deep-Sea Coral Sample

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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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In some reefs, small fishes such as this broad-barred goby protect corals by eating invading seaweeds.
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Coral Goby Cleans Coral

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