The rivers of the U.S. and other countries around the world are becoming more diverse and filling up with a wide range of invasive fish, but that may pose a threat to the "delicate balance" of ...

Migratory fish species are in drastic decline, a new UN report details. A global tally of how migrating animals are faring includes over 1,000 land and aquatic species.

Researchers have described how fish larvae rely on species-specific combinations of vision and movement to detect and capture ...

In the late-1970s, a small freshwater fish known as the snail darter made history when its newly acquired status as an endangered species helped to temporarily block construction of the Tellico Dam in ...

As U of I researchers studied the Signal Crayfish, they eventually identified two new species — the Okanagan Crayfish and Misfortunate Crayfish — in the Pacific Northwest.

DEC recently classified burbot, shown here, as a species of concern in a newly updated list of NY's imperiled fish species. Tane Casserley, NOAA Thunder Bay National Marine Sanctuary.