Jau

Nicknamed the Amazon's "Sumo Wrestlers," Jau catfish (Zungaro zungaro) are every bit as tough as their Piraiba and Redtail cousins. These brutes prefer well-oxygenated waters and favor rocky areas below waterfalls and rapids. Jau are masters of using their environment to their advantage.
Once hooked, they'll make a powerful dash straight back to their rocky haven, attempting to snag your line on the sharp edges. These brawlers can reach over 180 pounds in some rivers, with an average weight of around 30 pounds.