The UN assessment of the state of migratory freshwater fish revealed an 81% decline in the last 50 years.

A first-of-its-kind assessment of migratory freshwater fish brings to light many species in need of international protection.

Hidden beneath the surface of the world’s rivers, some of Earth’s great animal movements unfold – migrations that rival, in sheer biomass, the famous mass movements of zebra and wildebeest across the ...

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

Several iconic fish species are now slipping quietly into rarity, their disappearance reflecting a deeper crisis unfolding ...

Setting up an aquarium requires more than just buying a tank and filling it with water. You must also determine tank size, water temperature, and, of course, the fish that will call the tank home. To ...

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

Reef fish in different oceans often develop similar color patterns because evolution explores the same set of biological ...

Add Yahoo as a preferred source to see more of our stories on Google. array of white fish on blue plank background - Lauripatterson/Getty Images We may receive a commission on purchases made from ...

Experts warn that some of the most familiar fish species could face local extinction within decades. Read more at ...