but not unheard of Trichomycteridae Hydrolycus scomberoides "13 Scariest Freshwater Fish: Piranha" NacionalGeography See National Geographic's 13 scariest freshwater animals tigerfish dreaded candiru See the scariest freshwater fish tigerfish 13 Scariest Freshwater Creatures 13 Scariest Freshwater Animals resides in the Amazon River National Geographic National Geographic but not unheard of