The giant freshwater stingray may be the world’s largest freshwater fish. It’s also cloaked in mystery. No one is sure how many giant stingrays are left, which habitats they prefer ...

According to the Guinness Book of Records, a nine-foot-long individual caught in northern Thailand in 2005 weighted an astounding 646 pounds, making it the largest exclusively freshwater fish ever ...

A report has warned of a "catastrophic" decline in freshwater fish, with nearly a third threatened by extinction. Conservation groups said 80 species were known to have gone extinct, 16 in the ...