Monster Fish S5 World’s Biggest Sting Ray

National Geographic Channel - 2016.06.07(Tue) 11:35AM Schedule
If reports are true, two species of River Rays could be the world's biggest freshwater fish. The giant stingrays of Thailand and the whiprays of Australia are rumored to grow up to 16 feet and 1,300 pounds. Biologist Zeb Hogan is heading into the wilds, braving the elements and aggressive bull sharks, to find out if rays this big do exist.