Some of the longest, most important migrations of species on Earth are happening beneath the surface of the world's rivers ...

Bass in southeastern rivers turn out to be two species, highlighting hidden diversity and growing threats from habitat ...

In the wide, sandy stretches of Brazil’s Araguaia River, the piraíba, South America’s largest catfish, is a cornerstone of ...

A sweeping global report finds that migratory freshwater fish are in steep decline, with populations down roughly 81% since ...

Emperor cichlids, large fish native to Lake Tanganyika in Africa, don't like being stared at, especially if someone's gaze is ...