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| Order | Family | English Common Name | Spanish Common Name | Portuguese Common Name | Scientific Name | Belonging | Conservation status | Notes | ||
| 1 | Characiformes | Characidae | Tetra | Mojarra | Bryconamericus iheringii | Native | ||||
| 2 | Uruguay tetra | Piava | Cheirodon interruptus | Native | ||||||
| 3 | Dientudo | Oligosarcus jenynsii | Native | |||||||
| 4 | Mojarra | Psalidodon eigenmanniorum | Native | |||||||
| 5 | Mojarra | Psalidodon pampa | Native | |||||||
| 6 | Cyprinodontiformes | Anablepidae | One Sided Livebearer | Madrecita | Barrigudinho | Jenynsia lineata | Native | |||
| 7 | Poeciliidae | Ten Spotted Live Bearer | Madrecita Diez Manchas | Cnesterodon decemmaculatus | Native | |||||
| 8 | Siluriformes | Callichthyidae | Tachuela | Corydoras paleatus | Native | |||||
| 9 | Heptapteridae | Catfish | Bagre Negro | Rhamdia quelen | Native | |||||
| 10 | Pimelodidae | Long Whiskered Catfish | Bagre Cantor | Pimelodella laticeps | Native |