[n = 24]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | Hungary | established | |
| unknown | Unknown | Germany | established | unknown |
| unknown | Russia | China | not established | unknown |
| 1957 - 1959 | Former USSR | Romania | established | probably none |
| 1970 - 1979 | Unknown | Lithuania | not established | some |
| 1963 - 1974 | Russia | Kirgizia | probably established | |
| 1982 - 1988 | Kirgizia fish farms | Uzbekistan | established | |
| 1954 | Unknown | Latvia | established | |
| 1954 | Unknown | USSR | established | |
| 1954 | Unknown | Ukraine | unknown | |
| 1957 | Unknown | Belarus | established | |
| 1959 | Russia | Estonia | established | some |
| 1965 | Former USSR | Finland | established | some |
| 1966 | USSR | Poland | established | some |
| 1970 | USSR | Slovakia | established | probably some |
| 1970 | USSR | Czech Republic | established | probably some |
| 1970 | Unknown | Bulgaria | established | |
| 1972 | Czechoslovakia | Japan | probably not established | |
| 1972 | USSR | Japan | probably not established | |
| 1977 | Czechoslovakia | Yugoslavia | established | |
| 1978 | Ulan Ude in Buryatia, Russia | Mongolia | established | no data |
| 1978 | Czechoslovakia | Belgium | established | some |
| 1981 | Czech Republic | France | probably not established | probably none |
| 1985 | Japan | China | not established | unknown |