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Giant clams are one of the many wonders of coral reefs. They can grow up to five feet wide, weigh over 400 pounds, and live for 100 years!
Photo

Restocking Giant Clams

Giant clams are one of the many wonders of coral reefs. They can grow up to five...
Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
Photo

Unhealthy Coral Reef, Kiritimi, Line Islands

Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas...
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.
Photo

What Is Coral? A Coral Polyp and Zooxanthellae

What are corals? Corals themselves are animals. But tropical reef-building corals...
Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Photo

Coral Reef on Gangga Island, Indonesia

Corals, sponges, and algae are the major components of most coral reef communities....
Pink crustose algae covers the surface of a rock.
Photo

Encrusting Pink Algae and a Seastar

Like pink paint, crustose coralline algae covers the surface of the rock in a thin...
Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
Photo

Pink Coralline Algae

Many species of pink coralline algae cover a reef surface in the Southern Line...
Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
Photo

Surgeonfish: Indicators of a Healthy Reef

Convict surgeonfish (Acanthurus triostegus) are the roaming sheep of the reef but,...

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  • Ocean Life
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