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A tornado of sardines swirls around diver and photographer Erwin Poliakoff in the Philippines.
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Why the Littlest Fish Matter a Whole Lot

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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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Wooden painted fish on a school fence.
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Chinook Salmon: One Species at a Time

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Tropical hatchetfish, like the one shown in this X-ray photograph, live in the dark depths of the ocean. Like many other deep-sea fishes, they have large eyes and bioluminescent spots on their bellies.
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X-Ray Image of a Tropical Hatchetfish

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The weedy sea dragon male can hold around 250 eggs in his pouch.
Photo

The Dragon of the Sea

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“The male weedy seadragon is entrusted with the pink, fertilized eggs once mating has been completed. It is his task to incubate them until their hatching, approximately eight weeks later. The day this photo was taken, the weather and conditions were unu
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Weedy Seadragon, Flinders pier, Flinders, Victoria, Australia

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X-ray image of a long-spined porcupine fish
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X-Ray Image of a Long-Spined Porcupine Fish

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Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
Photo

Surgeonfish: Indicators of a Healthy Reef

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The fluorescent shortnose greeneye fish.
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A Shortnose Greeneye Fish Aglow

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A glowing ocean surface.
Article

Six Ways to See Ocean Ocean Bioluminescence

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Photo of the head of a leafy seadragon
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Devoted Dads: From Seahorses to Sea Spiders

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A school of bluefin tuna
Article

The Great Pacific Migration of Bluefin Tuna

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