Colorful fish swim in blue water.

Fish

A school of bluefin tuna

Meet the Bluefin Tuna

Bluefins are an impressive fish. Learn about the Pacific bluefin's major migration across an entire ocean.

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Featured Content

A blue parrotfish

Tough Teeth and Parrotfish Poop

On coral reefs fish are important links in the food chain that sustains higher-order predators (including humans) and keeps everything in balance.

Fish Get Risky Around Oil

A tornado of sardines swirls around diver and photographer Erwin Poliakoff in the Philippines.

Why the Littlest Fish Matter a Whole Lot

A school of akule (Hawaiian for bigeye scad) explode into a camera's frame.

Following the Akule

Orange roughy and various marine species, bycatch, on the deck of a research trawler

Rough Going for Orange Roughy

Are You An Educator?

At Smithsonian Ocean, we have lesson plans, activities, and resources to help you engage your students in the wonders of our oceans.

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Fish Articles

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Photo of the head of a leafy seadragon

Devoted Dads: From Seahorses to Sea Spiders

A submersible explores the deep reefs off of Curacao in the Caribbean.

Summer in a Sub: DROP Down to Discovery

A photo of a sea toad specimen.

A Sub and a Sea Toad

An underwater photo of Southern Bluefin Tuna swimming above a fish farm net.

Tunas and Marlins Officially Classified as Threatened

A photo of a swimming Protanguilla palau, the newly discovered genus and species of eel

Scientists Call New Eel Species A Living Fossil

The Autonomous Reef Monitoring Structure was developed to help scientists study coral reef diversity and have now been adopted broadly to study diversity around the world.

Uncovering Biodiversity… with ARMS and a Submarine Claw

A tusk shell hermit crab peeks out of his shell.

Uncovering Biodiversity Before It Disappears

Red Pigfish and Blue Mao-Mao school at the edge of a cavern in New Zealand's Poor Knights Islands. Read photographer Brian Skerry's story behind this photo.

Behind the Photo: The Primal Ocean

A whale shark swims with a diver off the coast of East Africa.

The Big Five of the Ocean: Exploring the Waters of East Africa

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

Helpful Herbivores

Grey reef sharks are among the most versatile and tough predators on a Pacific coral reef, but they are also among the most vulnerable species, as they are threatened by wasteful fishing practices like shark finning.

Where the Shark and the Snapper Roam

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

From Despair to Repair: Protecting Parrotfish Can Help Bring Back Caribbean Coral Reefs

Banner Credit

Russell Gilbert, flickr