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 ...

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 ...