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

Scientists have discovered the fossilized remains of a new fish species called Ferruaspis brocksi, which lived 15 million ...

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 ...

The coelacanth has gills similar to those of fish living at the depths in which ... these fishes' paired lobe fins are supported by the same basic bones as your arms and legs.

Owners should also watch out for infection and diseases such as fin rot, dropsy, and swim bladder disease. While Betta fish can tolerate dirty water for a short period, long exposure can cause ...

These upright fish have a dorsal fin that flutters 30 to 70 times per second to provide forward propulsion. They also have a set of small pectoral fins near the back of their head that are used to ...

Making up for the world's disappointment that there wasn't a prehistoric creature living in a Scottish loch was the South African discovery of a strange, steel blue fish with limb-like fins. The fish ...