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Gerardia, or gold coral, species often have a tree-like shape, as evident in this specimen.
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Gold Coral

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A small gray fish with two orange stripes, hides in between corals.
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Tiny Fishes Fuel Coral Reefs

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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A Tale of Sex and Stress in the Ocean

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Two nurse sharks hover over a baited cage
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Life of a Coral Reef Fish

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A soft, yellow coral
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Soft Coral

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The branches of a primnoid coral in the genus Calyptrophora provide a habitat for galathaoid crabs.
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Primnoid Coral

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Unlike the shallow tropical coral reef at left, the deep-sea Oculina reef at right does not require sunlight.
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Shallow and Deep-Sea Coral Reefs

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A scuba diver explores elkhorn corals growing on a tropical reef.
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Exploring a Reef

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This piece of pocillopora, or cauliflower coral, would normally have a rigid outer skeleton, but researchers dissolved it to expose the coral’s tissue and take a sample for DNA analysis.
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Cauliflower Coral - Pocillopora

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Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

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A red snapper hunts for prey on Kingman’s Reef, a healthy reef in the Line Islands.
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Kingman’s Reef, Line Islands

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Colorful corals are disappearing in the Great Barrier Reef.
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Coral at the Great Barrier Reef

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