The cardinal tetra is one of the most popular pet fish in the world. They look like little red and blue sequins. You've ...

From the Andes to the Atlantic and back again, the dorado catfish reveals the connectivity of one of the world’s largest ...

Add Yahoo as a preferred source to see more of our stories on Google. Thousands of fish species — about 2,500 of them named — call the Amazon River home, but scientists estimate nearly half of the ...

Vast journeys, among world’s great wonders, found to be under threat as freshwater fish populations crash by 81% ...

Deep in the vast rivers and flooded forests of the Amazon Basin, there lives a fish that appears to be prehistoric in both size and appearance. The arapaima, also called the “pirarucu,” is one of the ...

Smaller fish species are more nutritious, lower in mercury and less susceptible to overfishing, a Cornell-led research team has found. The team's study was conducted in the Amazon River, but the ...