[n = 5]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | Kazakhstan | probably established | |
| 1954 - 1956 | Caspian Sea | Aral Sea | unknown | |
| 1936 | Unknown | Dnieper and Pripyat | established | no data |
| 1970 | Romania | Hungary | established | unknown |
| 1997 | Unknown | Baltic basin, Poland | established | probably some |