Amazonian fish photograph identification guide Order Characiformes – Piranhas, tetras and characins Hoplerythrinus unitaeniatus Aimara Hoplias malabaricus Trahira / Wolf fish / Tiger fish Acestrorhynchus falcatus Spotted cachorro Leporinus trifasciatus Triportheus angulatus Dusky narrow hatchetfish Chalceus erhythrurus Tucan fish Tetragonopterus argenteus Semaprochilodus amazonensis Kissing / Flag-tailed prochilodus Prochilodus nigricans Black prochilodus Serrasalmus rhombeus Red-eyed / White piranha Serrasalmus humeralis Parambeba Pygocentrus nattereri Red-bellied piranha Metynnis hypsauchen Silver dollar Myleus rubripinnis Red hook silver dollar Mylossoma duriventris Silver mylossoma