While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

Aquarists use antibiotics to treat bacterial infections, such as fin rot, in fish. For the best chance of helping fish ...

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

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.

but the Speartuna can be a surprisingly elusive fish to track down. Here's how to reliably find a Speartuna Fin in Monster Hunter Wilds without spending hours checking every fishing hole.

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 ...

Sharks worldwide are imperiled by overfishing. Yet experts disagree on whether policies in Florida and the U.S. aimed at protecting sharks have in fact done the opposite. In Part I of this three-part ...