Researchers identified a new freshwater fish species in South Africa after years of genetic testing and analysis.

In the canals, marshes, and swamps of the Florida Everglades, invasive fish are silently slipping into new waterways. Among them are the Asian swamp eel and the bullseye snakehead, two air-breathing ...

A search for a fish lost to extinction led to a brand-new species hiding in a South African river.

A dozen fish pulled from a South African river sparked years of debate before being confirmed as a new species.

There's compelling news from the Texas Parks and Wildlife Department’s A.E. Wood State Fish Hatchery in San Marcos. Recent genetics testing performed on a scale sample from an 8.15-pound largemouth ...

This eerie, bulging-eyed fish lived beneath Antarctic ice for centuries - and scientists only just realized it's a new species.