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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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A satellite image of Hurricane Sandy as it passed over Cuba and Jamaica on October 25, 2012.
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Hurricane Sandy "Frankenstorm" Over Cuba

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Coral Sand
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Coral Sand Under a Microscope

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Spiral-tufted bryozoan
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A Bryozoan's Medical Endosymbiont

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A humboldt squid releases ink.
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Humboldt Squid Shoots Ink

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Stephanocyathus (A.) spiniger, a solitary, deep-water stony coral species, has six long spines that slow it from sinking into soft substrates.
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Solitary Deep-water Corals

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A longshoreman standing in front of a large pile of oyster shells on waterfront pier in Atlantic City in 1910.
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Counting Mountains of Oysters

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A transparent amphipod looks a bit like a lobster, surrounded by white eggs.
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Amphipod: Salp Invader

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A sea butterfly, or sea snail, swims in the open ocean.
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A Swimming Snail

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This close-up view of salps, which have aggregated together into a long chain, have brilliant red guts from eating red plankton.
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Close-up View of Salps

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Small orange brittlestars on the coast of the Atlantic.
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An Invasive Brittlestar

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
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Kelp Pennant

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