The typical dorsal fin is a triangular-shaped piece of skin wrapped around muscles and bony spines or rays that sits on a ...

Great Lakes tribes and state biologists are working together to reintroduce Arctic grayling to northern Michigan's waterways ...

Its teeth are designed not so much to grab or slice fish but to prevent them from escaping ... these fishes' paired lobe fins are supported by the same basic bones as your arms and legs.

Their streamlined torpedo shape helps them gather enough underwater speed to break the surface, and their large, wing-like pectoral fins get them airborne. Flying fish are thought to have evolved ...