'World's biggest' freshwater fish netted in Cambodia

The researchers fitted an acoustic tag to the stingray before returning it to the river

The stingray was more than twice the weight of an average lowland gorilla

A fisherman on the Mekong river in Cambodia has hooked the biggest freshwater fish ever recorded, scientists said -- a 300-kilogram stingray.

The monstrous bottom-dweller beat the previous record for biggest recorded freshwater fish, held by a 293-kilo (646-pound) Mekong giant catfish caught in Thailand in 2005, the US-funded Wonders of the Mekong research project said.