Scientists discover and name a colorful, new species of aquarium crayfish, Cherax pulverulentus, hiding in plain sight for decades.

Aquatic ecologist Magdy Khalil has the most unusual of jobs. He's traveling from community to community along the river Nile, teaching Egyptian fishermen and farmers about the American crayfish.

Tiny extremophiles give the salty lakes their rosy hue, but over-mining and climate change are threatening their existence.

In a river of western Brazil, an “armored” creature with bumpy lips swam through the “dark tea-colored” waters. Something ...