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A stingray swims in an Australian marine reserve.
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Australia's 1.2 Million Mile Marine Reserve

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But closer to the CO2 seeps, the complex reef has been replaced by a “monoculture” of boulder corals.
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Monoculture of Boulder Corals

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a display case of red coral jewelry containing necklaces, earrings, bracelets, and rings
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Avoid Coral Jewelry

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Coral Reef on Gangga Island, Indonesia

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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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These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
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Bleached Corals

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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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Shallow water coral reefs straddle the equator worldwide.
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Global Distribution of Shallow Coral Reef Ecosystems

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Researchers adopted the “yabbie pump,” the long silver tool shown here, from Australian fishing gear.
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Collecting Shallow-Water Specimens with the "Yabbie Pump"

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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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Coral Spawning by Moonlight

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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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