The critically endangered fish, discovered in the commercial aquarium trade, can only be found in one forest swamp on Sumatra, Indonesia.

The “extraordinary” new species has adaptations that allow it to survive in temporary bodies of water that dry out completely ...

A coelacanth, known by some as the "dinosaur fish," was spotted in eastern Indonesia in a rare sighting of a species once ...

A pattern began to emerge: the Niari River fish were subtly but consistently different from other known species. Researchers realized they’d discovered a new species — Labeo niariensis ...

The Arctic landscape during the Cretaceous Period may have been dominated by the dinosaurs, but the rivers and streams held something more familiar. Alaska's fresh waters 73 million years ago were ...

What do you do with a bizarre-looking dead fish that’s missing an eyeball and could be mistaken, at a distance, for a monster ...

Two new species of small fish were discovered in creeks outside the Birmingham metropolitan area in Alabama, according to a new study. Photo from Fouad Abou-Rizk “Brilliantly” colored fish ...