The Giant freshwater stingray is one of the largest freshwater fish in the world. It appears in Season 2, episode 2, where Jeremy Wade attempts to catch and release a specimen.
Jeremy initially hooks on to what he believes to be a 700-pound giant, however it takes over an hour for the fish to show. Jeremy Wade has already snapped a tendon trying to bring the fish in when his rod snaps releasing the beast.
Jeremy tries again, and the second time he hooks into a slightly smaller 400 pound fish. However, this one is still extremely difficult. He is able to bring the fish in. Amazingly, it gives birth once he caught it.