Luke Massey / Giant otters (Pteronura brasiliensis) feed on a Golden dorado (Salminus brasiliensis) Pantanal, Brazil.

Franco Banfi / Piraputanga fish (Brycon hilarii) split level, in the main spring at Rio Sucuri, Bonito, Mato Grosso do Sul, Brazil.

Franco Banfi / Freshwater Dorado (Salminus brasiliensis) Recanto Ecologico, Rio da Prata, Bonito, Mato Grosso do Sul, Brazil

Angelo Gandolfi / Piraputangas (Brycon hilarii) reflected in the surface of the water, Bonito, Mato Grosso do Sul, Brazil.

Angelo Gandolfi / Snorkeller with shoal of Piraputanga (Brycon hilarii), Rio Olha d'Agua at Cabeceira do Prata, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi,Franco Banfi / Piraputanga (Brycon hilarii) in the main spring Aquario Natural that goes in the Rio Baia Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Piraputanga (Brycon hilarii) reflecting on the water surface, Aquirio Natural, Bonito, Mato Grosso do Sul, Brazil

Willem Kolvoort / Tetra (Moenkhausia surinamensis) under Apinagia leaves. Awadan rapids, Gran Rio, Suriname, September.

Luciano Candisani / Piraputanga (Brycon hilarii) schooling in clear water stream, Cerrado Ecosystem, Bodoquena Plateau, Brazil

Claus Meyer / Blacktail Piranha (Pygocentrus piraya) underwater portrait, Amazon, Brazil

Konrad Wothe / Blacktail Piranha (Pygocentrus piraya) on hook showing sharp teeth, Pantanal, Brazil

Emanuele Biggi / Animal body parts including snakes and pirhanas for sale at Belen market in Iquitos, Peru. July 2014