From spots to stripes to dazzling colors, these fish have captured our hearts with their good looks. These five made our list of the prettiest fish in fresh water. / Ken Baldwin If you asked ...

Rivers have been the lifeblood of human civilization throughout history, and yet we know surprisingly little about what lives in many of them—including the giant creatures that prowl their depths.

This 646-pound Mekong giant catfish was caught in 2005. Suthep Kritsanavarin. In the Mekong, where more giant fish species are found than in any other river, climate change is causing more severe ...