| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Black Sea | Sea/Bay/Gulf | native | 12215 |
| Bug | River (basin) | introduced | 92885 |
| Caspian Sea | Lake | native | 12215 |
| Danube | River (basin) | introduced | 52516 |
| Don | River (basin) | native | 26334 |
| Kuban River | River (basin) | native | 58296 |
| Palearctic | Zoogeographic realm | endemic | 12215 |
| Sea of Azov | Sea/Bay/Gulf | native | 12215 |
| Vistula | River (basin) | introduced | 92885 |
| Volga | River (basin) | native | 26334 |