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Cardinalfish dads protect their eggs by gingerly carrying them in their mouths.
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Cardinalfish Dad with a Mouthful of Eggs

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A blue cod and sea pens, a unique type of cnidarian, speckle the seafloor in New Zealand's Fiordland region.
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Blue Cod Amongst Sea Pens

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A close-up photo of dead man's fingers (Alcyonium digitatum), living in the Baltic Sea.
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Dead Man’s Fingers

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A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
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Killer Algae (Caulerpa taxifolia)

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Shown here are several deep-sea coral species: From left to right are an unidentified purple octocoral, a small gold acanthorgorgiid octocoral, and a large colony of pink Corallium secundum
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Diverse Deep-Sea Corals

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Photo of sockeye salmon spawning.
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Sockeye Salmon, Adams River, British Columbia, Canada

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Scientists discovered this 1.5-m (5-ft) tall yellow bamboo coral in 2007 off the coast of Hawaii in 1,459 m (4,787 ft) of water.
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New Bamboo Coral Discovery

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Found 1,751 m (5,745 ft) below the surface of Hawaii’s waters in 2007, this orange bamboo coral is 1.2–1.5 m (4–5 ft) tall.
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New Genus of Bamboo Coral

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Red coral necklaces in a display window. Harvesting deep-sea coral to produce jewelry like this threatens these ecosystems.
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Coral for Sale

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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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Scientists recently discovered the Christmas tree coral (Antipathes dendrochristos) off the southern California coast.
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New Christmas Tree Coral

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Lights attached to this deep-sea camera system enable scientists to capture detailed images of deep-sea corals in otherwise dark water.
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Deep-Sea Camera

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