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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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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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

Two Views of Coral Reefs: Thriving and Threatened

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In this photo of a shallow coral reef in the Pacific there are three species of forams. Their colors come from the symbiotic algae that live inside the foram shells.
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Shallow Coral Reef Foraminifers

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Two nurse sharks hover over a baited cage
Lesson Plan

Coral Conservation

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Overfishing and sedimentation have heavily impacted this reef off the coast of Guam.
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Coral Reef in Distress

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On Moorea, an island in French Polynesia, researchers are striving to complete a biocode—a DNA catalog of every life form big enough to pick up with tweezers.
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The Island of Moorea

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Coral reefs provide food for swarms of fish, both large and small.
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Coral Reef in the Florida Keys

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

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

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