Amazing video of a giant freshwater stingray caught in Thailand and covered as part of National Geographic’s Megafishes Project. This specimen measured 14ft long but fisherman in Thailand and Cambodia claim they can grow many times larger. Little is known about these freshwater giants but if the fishermen are to be believed (and why would a fishermen ever exaggerate a fish’s size?!), these stingrays, also known as whip rays, could be the world’s largest freshwater fish. Read more on the NGC site.