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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
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Hawaii’s Maro Coral Reef

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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Nuclear bomb in Bikini Atoll
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Nuclear Bombs on the Coral Reef

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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Two nurse sharks hover over a baited cage
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A Tale of Deep Corals

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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.
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Coral Under Pressure: Monitoring Bleaching In Real Time

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After ocean scientists sort deep-sea coral samples into their different types, they measure and photograph the specimens.
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Photographing Coral Samples

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A marine scientist performs a genetic analysis on a sample of deep-sea coral to find out if it is a known or new species.
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Genetic Analysis of Coral

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Walter Adey and the NMNH coral reef tank
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Walter Adey and Coral Reef Tank

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Two nurse sharks hover over a baited cage
Lesson Plan

A Reef of Your Own

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Staghorn Coral
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Staghorn Coral in a Hurricane

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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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