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Fish

Researchers Daniel Cerveny and Marcus Michelangeli collecting salmon from the Dal River in Sweden.

Salmon Are Being Exposed to Our Anti-Anxiety Medication, and It’s Making Them Take More Risks, Study Suggests

Atlantic salmon exposed to a common anti-anxiety drug migrate faster, according to new research. That’s not necessarily a good thing

Scientists recorded rig sharks producing sounds—potentially with their teeth. The clip is thought to be the first documentation of its kind.

Listen to the First Known Recording of Shark Sounds, a ‘Weird’ Audio Clip Captured at a Marine Lab in New Zealand

Researchers detected short clicking noises from rig sharks during handling in the lab, though they’re not sure why or how the sound is produced

"Mr. Blobby" is a blobfish discovered in 2003 off the coast of New Zealand. The preserved specimen is now housed at the Australian Museum in Sydney.

Voters Crown the ‘World’s Ugliest Animal’ as New Zealand’s Fish of the Year

The blobfish is specially adapted to life in the deep ocean, but it looks like a shapeless blob when brought to the surface. It beat out the other candidates with its “unconventional beauty”

The fish feasted on phantom midge larvae, insects and bivalves before they died.

Paleontologists Stumble Across 15-Million-Year-Old Fish Fossils That Are So Well Preserved, Their Last Meals Are Intact

Discovered in Australia, the fossils represent a new species that lived during the Miocene epoch and highlight how iron-rich rock can protect specimens over time

A new study suggests that the lemon shark, pictured here, is a better analogue for the megalodon's size than a great white.

Megalodon Might Have Been Longer and Skinnier Than Previously Thought, Growing Up to 80 Feet

A new paper suggests the enormous, extinct shark looked less like a bulky great white and more like an elongated lemon shark

Individual Antarctic krill are small, but the animals live in gigantic groups that can be seen from space.

Tiny Antarctic Krill Benefit the Planet in Big Ways, but Face a Barrage of Threats

The bountiful creatures sequester carbon and are a vital food source for marine predators, but their future is uncertain

Greenland sharks can live to be nearly 400 years old.

Greenland Sharks Can Live for 400 Years. Scientists Are Using DNA to Unravel Their Longevity Secrets

These large, mysterious creatures are the longest-living vertebrates on the planet—and their genomes could contain clues to how they prevent cancer and reach such an advanced age

In October 2024, scientists created dozens of man-made nests and deposited 300,000 Chinook salmon eggs. Now, those eggs are hatching.

Chinook Salmon Are Swimming in This California River for the First Time in More Than 80 Years

The juvenile fish recently hatched from eggs that scientists deposited in the gravelly riverbed of the North Yuba River last fall

Nutria have voracious appetites for vegetation, leading them to destroy wetland ecosystems.

The U.S. Fish and Wildlife Service Wants You to Eat These Giant, Invasive Rodents

As part of National Invasive Species Week, the agency is calling on Americans to “eat the invaders,” including swamp-dwelling nutria

An oarfish surfaced in Playa El Quemado, Mexico, earlier this month.

Cool Finds

See a Deep-Sea Oarfish Caught Alive on Video in a Rare Encounter on a Beach in Mexico

In Japanese folklore, appearances of these elusive marine creatures dubbed ‘doomsday fish’ are believed to foreshadow earthquakes, though scientists found no strong relationship between these events in a recent study

One of the study authors, Maëlan Tomasek, with a fish. The scientists found that wild fish will start to follow humans for food and can recognize individual divers based on what they're wearing.

Wild Fish Can Tell Human Divers Apart Based on Their Outfits, Study Suggests

Using visual cues, including colors on wetsuits, seabream in the Mediterranean learned to identify researchers that would feed them

The Punta Medanosa colony of Magellanic penguins on the coast of Argentina has nearly 8,000 breeding pairs. Other colonies number in the hundreds of thousands.

What Did Scientists Learn After Thousands of Penguins Were Slaughtered by Mountain Lions?

The thriving bird colonies likely grew over several decades because local shepherds had temporarily eliminated pumas

Arctic grayling live in many northern waterways, but they disappeared from Michigan in 1936.

These Shimmery Fish Disappeared From Michigan Nearly a Century Ago. Can They Make a Comeback?

Great Lakes tribes and state biologists are working together to reintroduce Arctic grayling to northern Michigan’s waterways

The coast horned lizard (Phrynosoma blainvillii) depends on chaparral habitat to survive. It has declined across much of its range due to habitat loss, whether from development or invasion of non-native grasses. After fires, non-native grasses often fill in habitat and create problems for the species.

Here’s How the Los Angeles Wildfires Are Affecting Animals, From Fish to Snakes to Birds

While scientists were able to save and move some creatures in the aftermath, researchers are worried about the prospects for other species

The swell shark pup at Louisiana's Shreveport Aquarium

Shark Pup Mysteriously Hatches in Aquarium Tank With Only Females. How Could This Birth Happen?

Experts say the case is either a rare form of asexual reproduction or an instance of (very) delayed fertilization

The fossil find, dubbed Danekræ DK-1295, contains regurgitated fragments of sea lilies.

Cool Finds

Fossil Hunter Discovers 66-Million-Year-Old Vomit in Denmark, Offering a Clue to the Cretaceous Food Chain

A marine animal snacked on some sea lilies that did not agree with its stomach—and we now know what happened next

Reef sharks are abundant in the new marine proteted area.

A New Marine Protected Area in the Marshall Islands Is Brimming With Life, Like a ‘Time Machine’ to Oceans Long Ago

The waters around two remote atolls in the central Pacific Ocean—spanning 18,500 square miles—are now protected from fishing

Lynx Spider by Manfred Auer won third place in the invertebrate portrait category of this year's Close-up Photographer of the Year contest.

See 15 Winning Images From the Close-Up Photographer of the Year Competition

The annual contest offers a glimpse into the hidden world of tiny scenes, from insects to fish to fungi

When a Japanese aquarium closed for a six-month renovation project, a sunfish named Mambo stopped eating and began rubbing up against the side of its tank. Aquarists wondered if the creature was lonely. (Mambo is not pictured.)

A Sunfish Got ‘Lonely’ When Its Aquarium Closed for Renovations. Then, Staff Found a Creative Way to Cheer It Up

The solitary fish named Mambo stopped eating and seemed to be missing its human visitors—so aquarists attached photos of human faces and uniforms to the side of its enclosure

Elephants, bats, rabbits and other mammals have exceptional hearing—and their outer ears may be a key reason why.

Why Do Mammals Have Outer Ears? Scientists Are Getting Closer to Solving the Mystery

Two new studies offer insights into the evolution and development of external ears, which appear in humans and other mammals but aren’t found in reptiles, birds or amphibians

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