The old idiom of being a fish out of water is never a positive thing. Instead, it paints a picture of being uncomfortable or ...

A trove of fossils in China, unearthed in rock dating back some 436 million years, have revealed for the first time that the mysterious galeaspids, a jawless freshwater fish, possessed paired fins.

The new species has been found in two small isolated waterways in Brazil's Atlantic Forest, according to a study.

Loaches include a wide variety of fish, but are typically small and found in freshwater systems. They are typically nocturnal ...

Curtin University researchers have revealed how the pelvic fins of fish such as sharks and chimaeras have evolved from their sudden appearance in the fossil record over 410 million years ago.

While not a true walking shark, it seems these small little animals aren’t the only one who use their pectoral fins in an unusual way. A new publication led by Kristian J. Parton of the Centre ...

An ancient fish sported something like fingers that were the precursors to our own digits, according to an analysis of a new fossil skeleton.

Sept. 28 (UPI) --Ancient fossils of a jawless freshwater fish appear to make a connection of the first sign of paired fins and the forerunner of arms and legs, researchers from China and Britain ...

A trove of fossils in China, unearthed in rock dating back some 436 million years, have revealed for the first time that the mysterious galeaspids, a jawless freshwater fish, possessed paired fins.