Nipping at the heels of potential mates, the stout, ray-finned pupfish gained its namesake from its striking resemblance to frolicking young puppies. Cousins to the well-known guppy, pupfish are not ...

Aquarium enthusiasts are often on the lookout for colorful and exciting species that they can raise in their personal tanks. Rainbowfish are a broad category of fish that meet these requirements.

For example, certain groups of ray-finned fishes show such regressive evolution—medakas, minnows, puffera, and wrasses do not ...

The aquatic world is full of a variety of species called sharks. Most people are familiar with the large, oceanic predators that you can find in waters throughout the world. But fewer people are ...