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A pair of French Angelfish (Pomacanthus paru) swim off the coast of Brazil.
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Pair of Angelfish

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An underwater photo of a yellow-mouth moray eel.
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Yellow-mouth Moray Eel in the Red Sea (Eilat, Israel)

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In some reefs, small fishes such as this broad-barred goby protect corals by eating invading seaweeds.
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Coral Goby Cleans Coral

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The weedy sea dragon male can hold around 250 eggs in his pouch.
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The Dragon of the Sea

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The mandarinfish lives in western Pacific tropical coral reef ecosystems and lacks the scales that are typically seen on bony fish.
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Mandarinfish Duo

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Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
Article

Helpful Herbivores

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Pygmy Seahorse Blends Into its Environment
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Eye to Eye With a Pygmy Seahorse

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
Slideshow

Bizarre and Beautiful Coral Reef Animals

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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

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A Pontoh pygmy seahorse
Slideshow

10 Things You Never Knew About Seahorses

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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.
Overview

Scientists Catalog Life on the Island of Moorea

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