[n = 9]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| Pre 18th century | England | Ireland | established | unknown |
| unknown | Unknown | Portugal | probably established | |
| unknown | Unknown | Spain | probably not established | |
| unknown | unknown | Turkey | probably not established | unknown |
| 1954 - 1956 | Unknown | Kyrgyzstan | established | |
| 1932 | Unknown | Russia | probably not established | |
| 1949 | Former USSR | China | probably established | |
| 1985 | Unknown | Italy | established | some |
| 2006 | Unknown | Ain Zada dam | not established |