Fish

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.

Scientists surveying the Detroit River caught a monstrous sturgeon weighing 240 pounds (109 kilograms) and measuring 6 feet 10 inches (2.1 meters) in length.

The longest sawfish ever measured washed up in Florida, not far from another large specimen.

A dead "river monster" from the Amazon was discovered in Florida, leading to concerns that the fish might become an invasive species there.

Dead sharks usually sink, so it's surprising to find one washed up onshore.

Scientists recently captured video documenting the first reported instance of a fish preying on a newly-hatched baby bird, in a flooded nest in coastal Georgia.

Happy 16th birthday to Mikko the grouper, a popular aquarium fish in Finland who missed his human visitors during the COVID-19 shutdown.

Digital models of a fish skull revealed a parasitic stowaway inside its mouth: a "tongue biter" isopod that consumed and then replaced the fish's tongue.

Scientists have identified the larvae of one of the world's biggest fishes — the bump-head sunfish (Mola alexandrini) — and the youngster is ridiculously tiny.

Hungarian scientists accidentally created a hybrid of a Russian sturgeon and an American paddlefish, leading to a long-nosed "sturddlefish" baby.

This extinct fish used its hand-like fins to "walk" on the ocean floor.

After snake eels are swallowed by bigger fish, they can burst out of their predators' stomachs ... to freedom? Not exactly.

An anchovy cousin had fang-like teeth on the bottom jaw and one giant saber tooth on the top.

Photos of a bright pink manta ray have gone viral after the Pepto-Bismol-colored creature was spotted swimming near Australia’s Great Barrier Reef.

The turbulent lower Congo River, home to hundreds of fish species, is not only Earth's deepest river; it also presents biologists with an intriguing window into evolution.