The Mae Klong River at Samut Songkhram province of Thailand & the Bangpakong River at Chaochoengsao province holds freshwater stingray to unimaginable sizes. Reports of 250Kg (550lb) freshwater stingray are not myths; and are known to grow in excess of 500Kg (1100lb).
The fighting characteristic of a hooked freshwater stingray is like no other freshwater fish. Being exclusively a bottom feeder, it instantly has the ability to 'suck' onto the river bed. The morphology of the freshwater stingray allows it to use it's giant, flat body shape to remain in this unshakeable immovable state. The fight at this point has not really begun at all until the angler manages to assert enough pressure on the fish resulting in it breaking it's hold on the bottom, forcing the fish to adjust it's position. In making this adjustment a short opportunity is created to started pumping the fish up off the river bed.