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Fish

A koala, Phascolarctos cinereus, with her babies at Australia Zoo Wildlife Hospital, 2011

This Amazing Archive of Animal Photography Reveals 18,000 Species and Counting. Here’s How Joel Sartore Built His ‘Photo Ark’

For 20 years, the National Geographic photographer has showcased Earth’s animals in a series of striking images that make even the tiniest creatures look immense

A blacktip shark, above, looks and behaves like a spinner shark. Scientists are tracking spinner sharks to get a clearer idea of the species' whereabouts.

These Shark Look-Alikes Have Long Confounded Fishers and Scientists on the East Coast. Tracking Where They Migrate Could Help Clear the Confusion

Researchers are tagging and tracking spinner sharks to map out their geographic distribution, because they’ve seen that the range of the very similar blacktip shark has shifted

A catfish with melanoma, a kind of skin cancer

A Strange, Never-Before-Seen Cancer Seems to Be Spreading Among Catfish in a New England Lake

More than a decade ago, fishers and biologists noticed jet-black tumors on the skin of brown bullhead catfish in Lake Memphremagog. Genetic testing hints that they are caused by the first contagious cancer ever documented in fish

A 52-foot-long model of a female Otodus megalodon is suspended from the ceiling at the Smithsonian National Museum of Natural History.

Predatory Sharks Grew to Enormous Sizes in Prehistoric Times. These Five Strategies Helped Them Get So Big

By cannibalizing their siblings in the womb or avoiding meat-eating pliosaurs, fearsome carnivores like the megalodon ballooned to proportions that would dwarf any shark alive today

The brown trout were likely introduced to guarantee a food source if reindeer hunts were unsuccessful, according to a new study.

Hunter-Gatherers Brought Trout to a Norwegian Mountain Lake 7,000 Years Ago, the Earliest Known Example of Humans Translocating Fish

Researchers have long known that the animals were introduced into the region’s high-altitude bodies of water, but they weren’t sure when it happened or whether humans had a hand. Analyses of recently discovered ancient fish traps provide new clues

A new study documents two incidents of orcas breaking sunfish into pieces.

Video Captures Orcas Ramming a Sunfish So Hard It Explodes. The Mysterious Behavior Might Be a Form of Play or Juvenile Care

In two incidents documented in Mexico’s Gulf of California, orcas worked together to blast sunfish into smithereens after they had killed the enormous animals

Two dolphins swim up to the camera. The recognized images from this year's Ocean Conservancy Photo Contest all feature animals.

These 11 Wildlife Images From the Ocean Conservancy’s Photography Contest Showcase the Wonder of Earth’s Waters

Seals, penguins and fish are featured in the nonprofit’s annual competition to inspire care for the world’s oceans

The researchers tracked eye and body movements of larval zebrafish.

Fish and Humans Share Surprisingly Similar Sleep Habits, Including Daytime Naps

A recent study suggests that zebrafish have four sleep substates, just like humans do—and one of them is akin to an afternoon snooze

The new species is covered in spots and dashes.

Scientists Discover a New Species of ‘Walking’ Shark in Papua New Guinea. They Suspect It’s at Risk of Going Extinct

The creature belongs to a unique group of sharks whose members can use their strong pectoral fins like legs to get around

A female blue crab with an acoustic telemetry tag on its shell. Scientists at the Smithsonian Environmental Research Center use telemetry tags to track the migration of blue crabs throughout the Chesapeake.

Young Blue Crabs Have Been Mysteriously Dwindling in the Chesapeake Bay for Years. This Winter, They Saw a Boost in Numbers. What’s Driving These Trends?

A recent report detailed a 50 percent drop in juvenile Chesapeake blue crabs since 2010. Then, a survey found a surprising surge in the young crustaceans this year

One-celled algae called diatoms are unique because their cell walls are made of transparent silica, like glass, allowing their internal patterns to be visible. Diatoms are key producers of atmospheric oxygen and uphold the aquatic food chain.

See 17 Intricate Microscope Photographs That Make the Miniature World Immense. They Won the Evident Image of the Year Contest

The sixth annual competition showcases scientific microscopic imaging, illuminating tiny parts of nature, from individual cells to arthropods, diatoms and a zebrafish brain

In experiments, juvenile Atlantic salmon that were exposed to cocaine’s primary metabolite swam more and dispersed farther than their sober peers.

Cocaine Pollution Seems to Make Salmon Swim Farther Than Usual. Scientists Don’t Know the Long-Term Consequences

The illegal drug’s main byproduct, benzoylecgonine, caused more robust effects than cocaine itself. Wastewater treatment plants often don’t fully process such metabolites, so they are frequently found in bodies of water at higher concentrations than their parent drugs

The reseachers investigated preserved specimens kept at museums, like this Bufoceratias wedli from the Field Museum in Chicago.

Anglerfish Are Known for Their Built-in Fishing Rods. New Research Sheds Light on How These Lures Evolved in the Strange Creatures

A new study suggests the odd appendages first appeared in the fish’s ancestors around 72 million years ago. Today, females might use them not only to attract prey but also to communicate with potential mates

Málaga’s famous espetos, or sardines, are cooked over an open flame in traditional blue fishing boats right on the beach.

Coastal Cities of Europe

Chiringuitos Offer the Quintessential Beach Bar Experience on Spain’s Costa del Sol

Steeped in history, the seafood joints are evolving to keep up with a global clientele and tightening environmental regulations

Images of shellear fish climbing up the rock face behind Luvilombo Falls

Watch These Rock-Climbing Fish Scale a 50-Foot Waterfall in the Congo Basin, the First Known Evidence of This Behavior in Africa

The tiny fish, called shellears, use microscopic hook-like growths on their fins to ascend—and they take a lot of breaks. The full climb probably takes about ten hours, according to a new study

The Mekong giant catfish is an endangered freshwater species.

Freshwater Fish Migrations Are Disappearing Across the Planet, Finds U.N. Report

The assessment identified over 300 species of fish that urgently need international conservation effort

Domino the warty frogfish is about the size of a pea.

Meet Domino, a Tiny, Bumpy Fish Making a Splash in Chicago

The warty frogfish, also known as a clown anglerfish, is believed to be the first of its kind born and raised in captivity

Spinosaurus was the largest and most aquatic of the spinosaurs, a group of dinosaurs with crocodilian snouts.

Was Spinosaurus Really a ‘Hell Heron’? Digging Into the Star of Netflix’s ‘The Dinosaurs’

With an incredible sail and heavy bones that might have acted as ballast, Spinosaurus seems primed for snatching fish. The creature has long captivated the public, from its early mysteries to the recent discovery of a new species

Modern fish traps require pilings that are driven into the riverbed and netting that reaches across part of a river.

Fish Traps Have Been Banned on the Columbia River for Nearly a Century. Could Bringing Them Back Help Save Salmon?

A new experiment is testing the commercial success of fish traps in Washington and Oregon. Even as some conservationists embrace the technique, its return has reopened old wounds among local fishers

A pottery vessel analyzed for the study

New Research

Scientists Discover Microscopic Traces of Leaves, Seeds and Toxic Berries on Pots Used by Stone Age Cooks Thousands of Years Ago

Hunter-gatherers in Europe carefully selected ingredients and cooked complex foods, often pairing fish with specific plants, according to a new study

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