| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Aral Sea | Sea/Bay/Gulf | introduced | 26334 |
| Black Sea | Sea/Bay/Gulf | native | 50519 |
| Bug | River (basin) | introduced | 52518 |
| Caspian Sea | Lake | native | 2058 |
| Danube | River (basin) | native | 56371 |
| Dnester | River (basin) | native | 86607 |
| Dnieper | River (basin) | native | 26334 |
| Don | River (basin) | native | 26334 |
| Kuban River | River (basin) | native | 58296 |
| Palearctic | Zoogeographic realm | introduced | 2058 |
| Vistula | River (basin) | introduced | 52518 |
| Volga | River (basin) | native | 26334 |