| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Danube | River (basin) | native | 5723 |
| Don | River (basin) | questionable | 58293 |
| Kuban River | River (basin) | questionable | 58296 |
| Mississippi River | River (basin) | native | 5723 |
| Missouri River | River (basin) | native | 78789 |
| Nearctic | Zoogeographic realm | endemic | 5723 |
| Palearctic | Zoogeographic realm | introduced | 5723 |
| Rio Grande | River (basin) | native | 5723 |
| Volga | River (basin) | introduced | 26334 |