A 300kg (661lb) stingray caught in the Mekong river in Cambodia is the biggest freshwater fish ever documented, scientists say. It unseated the previous record-holder, a 646lb (293kg) Mekong giant ...

The giant freshwater stingray may be the world’s largest freshwater fish ... with few large rays having been seen there since. The rays have also been targeted for the burgeoning aquarium ...

They are very large fish that need a spacious and heated ... They originate from the South American river basins and thrive ...

Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports. Native to southeast Asia, this species is known for its range of vibrant hues.

Getty Images Large fish such as sturgeon are dying out faster Carmen Revenga of The Nature Conservancy said freshwater fish are a diverse and unique group of species that are not only essential ...