Fish

Researchers stumbled across a bizarre species of blind cave fish with a mysterious, horn-like structure protruding from its head and a lack of scales or pigmentation.

Jewel damselfish living on coral reefs surrounding rat-infested tropical islands have become less territorial and less aggressive due to a bizarre ecological link between the two species: bird poop.

Mouthbrooding fish under stress may sometimes resort to cannibalism and eat their young. Scientists' discovery of the behavior was "a complete accident."

New research reveals exactly how inbred the Devils Hole pupfish is.

A new study has revealed that a 6,000-pound giant sunfish found dead in the Azores is the heaviest bony fish ever recorded.

An unusual surge in anchovy populations has led to the fish raining down on San Francisco. Here's why.

A 661 pound giant stingray caught in the Mekong River is the largest freshwater fish ever recorded.

For millions of years, megalodon was the top predator in marine ecosystems. Then great whites came along and ruined everything.

A conservation educator caught a record-breaking alligator gar in a bayou near Houston.

Scientists exploring the depths of Monterey Bay unexpectedly encountered a rare and unique species of dragonfish.

A new study has found that, after being misidentified for decades, a stunning rainbow fish is actually a brand-new species.

Hearts have become iconic symbols of Valentine's Day, but when it comes to hearts in the real world, one size doesn't fit all — particularly in the animal kingdom.

Two paddleboarders encountered a colossal sunfish in Laguna Beach, California.

Fishers in the Netherlands caught an enormous, bright-yellow catfish recently. The species is common, but the yellow body may be the result of a genetic disorder.

An angler fishing in Tampa Bay was surprised to reel in an unusual fish that looked just like a flour tortilla.

A 100-pound opah fish, also known as a moonfish, was recently found washed up on a beach in Oregon hundreds of miles from its normal habitat.

A detailed look at coelacanths' scales reveals that this ancient lineage of fish may live to be 100 years old.

Most marine creatures get their meals in the water, but snowflake moray eels have a strange adaptation that lets them grab and swallow prey on land, too.

Madagascar may be the ancestral home of coelacanths, 'living fossil' fish once thought to have gone extinct.