| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Iguazú River | River (basin) | native | 56308 |
| Mekong | River (basin) | introduced | 95066 |
| Neotropical | Zoogeographic realm | endemic | 37057 |
| Paraguay | River (basin) | native | 598 |
| Paraná | River (basin) | native | 11229 |
| Red River | River (basin) | introduced | 95066 |
| Uruguay | River (basin) | native | 56308 |