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 small fish with colorful organa and blue scales

Orange male guppies are hornier 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 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 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 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 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 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 Please stop releasing pet goldfish into the wild

By Laura Baisas

a dead fish being dragged on artificial turf

Dragging dead fish around reveals super power of mucus Dragging dead fish around reveals super power of mucus

By Ethan Freedman

a close up of a diver wearing a mask and a fish swimming towards him

Wild fish can recognize human divers Wild fish can recognize human divers

By Laura Baisas

a penguin swimming underwater in straight line making it look like it's flying

15 splashy and stunning underwater wildlife images 15 splashy and stunning underwater wildlife images

By Popular Science Team

a small brown fish swimming in a tank

These fish can mate 19 times per day These fish can mate 19 times per day

By Laura Baisas

Chaunacops fish with 2024 Look Back article headline

Ghost ships to ghost sharks: 10 wildest underwater discoveries of 2024 Ghost ships to ghost sharks: 10 wildest underwater discoveries of 2024

Striated frogfish (Antennarius striatus), also known as the hairy frogfish.

Anglerfish use ‘extremely rare’ mechanism to control their lures Anglerfish use ‘extremely rare’ mechanism to control their lures

waves in a deep cavern

Earthquake off northern California shook the water in Devils Hole, 500 miles away Earthquake off northern California shook the water in Devils Hole, 500 miles away

By Laura Baisas

The anglerfish species Lophius piscatorius.

Anglerfish are so much more than just their dangly bioluminescent lures Anglerfish are so much more than just their dangly bioluminescent lures

By Laura Baisas

a more colorful dominant male fish next to a more muted subordinate fish

Stress is warping these fish brains Stress is warping these fish brains

By Laura Baisas

a scan of a zebrafish with its eye highlighted in green and other parts of its anatomy stained red and blue

Mapping the shifting gaze of ‘fishlets’ Mapping the shifting gaze of ‘fishlets’

By Laura Baisas

two leopards fighting in dirt

14 dramatic moments from the 2024 Nature’s Best Photo Awards 14 dramatic moments from the 2024 Nature’s Best Photo Awards

By Popular Science Team

The ‘wild’ salmon on your menu might not be wild

The ‘wild’ salmon on your menu might not be wild The ‘wild’ salmon on your menu might not be wild

By Lauren Leffer

Jumping carp disrupt recreational boating and other water-based activities.

Chicago’s dirty water may be keeping invasive species at bay Chicago’s dirty water may be keeping invasive species at bay

By Lauren Leffer