A detailed look at coelacanths' scales reveals that this ancient lineage of fish may live to be 100 years old.
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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.
A dead "river monster" from the Amazon was discovered in Florida, leading to concerns that the fish might become an invasive species there.
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.
After snake eels are swallowed by bigger fish, they can burst out of their predators' stomachs ... to freedom? Not exactly.
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.
Scary portrayals of great whites in pop culture might lead some people to wonder if the world would be better off with no sharks at all.