| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Atlantic Ocean | Sea/Bay/Gulf | native | 683 |
| Baltic Sea | Sea/Bay/Gulf | questionable | 6114 |
| Elbe River | River (basin) | extirpated | 54732 |
| North Sea | Sea/Bay/Gulf | native | 683 |
| Palearctic | Zoogeographic realm | endemic | 683 |
| Rhine | River (basin) | extirpated | 27368 |