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In the X-ray image of this Viper Moray Eel (Enchelynassa canina), note the second set of jaws in the “throat”; these are the gill arches, which are present in all fish.
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X-Ray Image of a Viper Moray Eel

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Raccoon butterfly fish and angelfish on a reef in the Red Sea, near Sharm el Sheik, Egypt.
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Coral Reef Scene

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A pearly razorfish
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Pearly Razorfish

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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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Fish swim underwater amidst mangrove roots at Bocas del Toro, Panama.
Article

On the Trail of DNA in the Ocean

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A Pontoh pygmy seahorse
Slideshow

10 Things You Never Knew About Seahorses

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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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This queen parrotfish scrapes algae from Caribbean reefs with its parrot-like beak.
Article

From Despair to Repair: Protecting Parrotfish Can Help Bring Back Caribbean Coral Reefs

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

Bizarre and Beautiful Coral Reef Animals

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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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A school of Hawaiian squirrelfish.
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A School of Hawaiian Squirrelfish

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