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Syllid fireworms can be found mainly on the seafloor, but they switch to a planktonic form to reproduce, where the females use bioluminescent signals.
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Syllid Fireworms

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One of several rowboats that were sunk in front of Lake Hotel at Wyoming's Yellowstone National Park in the early 20th century.
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Underwater Parks in 3-D

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Phoenix Islands protected area
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Phoenix Islands

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Colorful Christmas tree worms
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A Forest of Christmas Tree Worms

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Underwater image of two fish swimming near branching and boulder corals
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Reef in Guatemala

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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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Scientists Catalog Life on the Island of Moorea

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Three gray fish swim in front of a large coral head.
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Cabo Pulmo Protected Area

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Searching for useful chemicals, ocean scientists grow bacteria associated with deep-sea coral on nutrient agar.
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Growing Bacteria from Corals

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Twin-spot snappers are curious top predators on Pacific coral reefs, eating a variety of fishes, shrimps, crabs, and snails among others, and are usually around 2.5 feet long.
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Curious Bohar

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Madison Stewart, known to many simply as “shark girl,” is an inspiring young woman with a passion to protect the creatures most people fear: sharks. She’s been diving with sharks since the age of twelve. Here she is feeding a group of Caribbean reef
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Shark Girl With Caribbean Reef Sharks

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The fringe of a white Christmas tree worm.
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White Christmas Tree Worm

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