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Despite its fearsome look, the Atlantic wolffish (or sea wolf) isn't a danger to humans, largely preying on whelks, crabs, and sea urchins.
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The Toothy Sea Wolf

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Two bright blue mandarine fish mating
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Mating Mandarin Fish

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The whitish spots on this fish are individual parasitic trematode worms.
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Parasitic Worms in a Fish

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

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Fish have certain adaptations, like blood with built-in antifreeze, to survive in the Antarctic.
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Fish Adapt to Icy Water

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The frogfish uses camouflage to hide from predators.
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Three-spot Frogfish

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A school of yellowfin surgeonfish feed near dusk off Canton Island in the Phoenix Islands.
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Yellowfin Surgeonfish

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A wrought iron butterflyfish being cleaned by a small wrasse in the waters of Japan's Ogasawara Islands.
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Butterflyfish and Wrasse

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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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The eel-like Atlantic hagfish being measured out of water.
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Pacific Hagfish

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Two bright orange anemonefish poke their heads between anemone tentacles.
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Clownfish in their Host Anemone

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A tiny yellow goby living inside an abandoned can on the seafloor; Suruga Bay, Japan
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Yellow Goby

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