Fish

Whether stream or ocean, the diversity and science of fish goes deep. This is the latest on the science of swimmers.

Latest in Fish

several full fish laying on ice. the fish are orange, white, and multicolored

Afraid your fish is too fishy? Smart sensors might save your nose

By Mack DeGeurin

Newly described muscle anatomy (right) and overall jaw anatomy of Dunkleosteus terrelli (center), compared to a more typical arthrodire (left)

Cleveland’s beloved ancient sea monster was more turtle than shark

Video screenshot of remoras attached to humpback whale

Ride on a humpback whale with little sucker fish

Screenshot of ROV video showing icefish nests on floor of Weddell Sea

The quest to find Shackleton’s ship uncovered an Antarctic mystery

A red cusk-eel burrowed in among tubeworms at a methane seep off the coast of El Quisco in central Chile. Credit: Schmidt Ocean Institute

Tiny spider crabs snack on parasites from Chile’s favorite fish

Research team lowering Redwing submersible into ocean from a boat

Self-piloting submarine set to begin historic mission to circle Earth’s oceans

Smelt fish under ice. Fish spawning in river. Pacific smelt

Fake fish blood may save your ice cream from freezer burn

Three leopard sharks mating in water

First-ever footage of leopard shark sex shows an unexpected trio

Red Hind Grouper in coral reef

Eavesdropping on grunting groupers reveals how the fish communicate

a large, flat head catfish with an open mouth

Monster catfish and its creepy smile invade PA rivers

By Laura Baisas

a fish with bright blue markings swim in a tank

A rainbow of fish dazzles in New Jersey

By Laura Baisas

a lake trout looking up from the water

Meet Mary Catherine, the Great Lakes’ oldest-known trout

By Laura Baisas

Norselaspis illustration

A googly-eyed fish could upend evolutionary history

several small fish with colorful organa and blue scales

Orange male guppies are hornier

By Laura Baisas

small fish in a net being rescued

After a devastating wildfire, rescued fish make a triumphant return to Malibu

By Margherita Bassi

a leopad seal with its mouth wide open

15 riveting images from the 2025 UN World Oceans Day Photo Competition

By Popular Science Team

a weedy seadragon swimming. they have long snouts and raised backs

Weedy seadragons in the running for nature’s best dads

By Margherita Bassi

Lab grown salmon on sushi rice on a plate

FDA approves lab-grown salmon

Mako shark swimming with orange octopus on its back

Shark’s ‘mystery hat’ turns out to be a giant octopus

a man on a boat holds a large orange pet goldfish

Please stop releasing pet goldfish into the wild

By Laura Baisas