| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Danube | River (basin) | native | 1739 |
| Douro | River (basin) | introduced | 13364 |
| Drava River | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | endemic | 59043 |
| Rhine | River (basin) | introduced | 30578 |
| Sava River | River (basin) | native | 59043 |
| Tisza | River (basin) | native | 59043 |
| Upper Danube | River (basin) | native | 59043 |