Fish

With over 32,000 described fish species, the varieties are endless. Most bony fishes are cold-blooded, covered in scales and breathe using gills—but there are exceptions to all of these rules.  

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X-ray image of a winghead shark

DIVE DEEPER

X-Rays of Fish Reveal Diversity

Scientists in the Division of Fishes at the Smithsonian's National Museum of Natural History use X-ray imaging to study the...
Orange roughy and various marine species, bycatch, on the deck of a research trawler

Rough Going for Orange Roughy

Orange roughy and bycatch on the deck of a research trawler off the east coast of Tasmania. Credit: Stephen McGowan, Australian Maritime College, 2006/Marine Photobank In the dark, cold waters 600 meters (nearly 2000...
An underwater photo of Southern Bluefin Tuna swimming above a fish farm net.

Tunas and Marlins Officially Classified as Threatened

The Southern Bluefin Tuna ( Thunnus maccoyii ) is listed as "critically endangered" on the IUCN's Red List of Threatened Species . If its population continues to decline, the species faces the possibility of...
Can painted wooden fish.

Chinook Salmon: One Species at a Time

Can painted wooden fish on a schoolyard fence change human behavior and help clean up the ocean for the real salmon? Stream of Dreams in British Columbia thinks so, and a lot of wooden...
John Paxton, a scientist who studies marine life, looks into a microscope

Examine the Clues

Ichthyologist John R. Paxton of the Australian Museum identifies freshly caught lanternfishes. Paxton was on the team that solved the whalefish mystery. Credit: R. Cornejo In 2003, a team of Japanese scientists analyzed the...

Video of the Palauan primitive cave eel (Protanguilla palau)

A video of the Palauan primitive cave eel ( Protanguilla palau ) swimming in the Pacific off the Republic of Palau . Jiro Sakaue, a Japanese research diver, first discovered the new genus and...
A photo of a swimming Protanguilla palau, the newly discovered genus and species of eel

Scientists Call New Eel Species A Living Fossil

A video of the Palauan primitive cave eel ( Protanguilla palau ) swimming in the Pacific off the Republic of Palau. A Japanese research diver first discovered the new genus and species in a...
Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.

Bioluminescent Animals Photo Gallery

Bioluminescence is one of the more captivating adaptations that have evolved in marine animals. It's the ability of organisms to create and emit light. Dive underwater and you may witness lightshows of red, green,...
Master carver Douglas Chilton rides in the Raven Spirit canoe at its ceremonial launch.

The Sant Ocean Hall: Salmon Shape a Way of Life

You may think of salmon as a good choice for a weekday dinner, or enjoy it smoked and sliced on a bagel. But that salmon on your plate has a long and illustrious history...
A photo of Oceana's ice class research vessel, the Hanse Explorer, on the Baltic Sea.

Biodiversity in the Baltic Sea

In the spring of 2011, a research crew from Oceana spent two months in the brackish Baltic Sea . The Baltic faces challenges from pollution, algae blooms, over fishing, and invasive species. Oceana researchers...

Exploring Ocean Life with an Underwater Vehicle

Studies along the Northwest Atlantic Ocean shelf break- the transition from continental shelf to slope- by researchers from Woods Hole Oceanographic Institution and Rutgers University are revealing connections between physical processes in the ocean...
A tiny yellow goby living inside an abandoned can on the seafloor; Suruga Bay, Japan

Image Gallery: The Perfect Underwater Photo

For nearly 35 years, National Geographic photojournalist Brian Skerry has been immersing himself in the big blue to get the perfect underwater photograph. He admits that there will never will be a "perfect" photo,...
This shrimp is colored to fit in - probably why they are common members of the seaweed community.

A World Adrift: Life in the Sargassum Slideshow

Smithsonian Marine Science Network Postdoctoral Fellow, Seabird McKeon, returns from the Smithsonian field site in Belize. Together with Dan Barshis of Stanford University, Seabird reports on the seemingly invisible inhabitants of drifting sargassum seaweeds...
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

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. Credit: Laetitia Plaisance/CReefs, Census of Marine Life If...
A tusk shell hermit crab peeks out of his shell.

Uncovering Biodiversity Before It Disappears

Editor's Note: See more information and details about the organisms displayed in the slideshow here . Researchers who come to Curaçao to take part in DROP ( Deep Reef Observation Project ) aren’t running...
On Moorea, an island in French Polynesia, researchers are striving to complete a biocode—a DNA catalog of every life form big enough to pick up with tweezers.

Scientists Catalog Life on the Island of Moorea

Welcome to Moorea, a tiny, isolated island in the middle of the vast Pacific. Moorea is 132 square kilometers (51 square miles) of tropical ecosystems – from jungle and wetlands to beaches and coral...

Behind the Photo: The Primal Ocean

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 . Credit: Brian Skerry, National Geographic A few...
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

A whale shark swims with a diver off the coast of East Africa. Credit: Caine Delacy When we think "Africa," we think of the "Big Five"—lions, elephants, leopards, buffalo and rhinos—that crisscross the African...
Colorful Christmas tree worms

Happy Holidays from the Ocean!

Ocean creatures may not sing carols and go ice skating, but some celebrate the winter holidays all year round! So turn on the “Jingle Shell Rock” and celebrate with these intriguing ocean animals.

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