[n = 27]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | USSR | not established | |
| unknown | Unknown | Jordan River | not established | |
| unknown | Unknown | Greece | not established | |
| 1933 - 1934 | Scotland | Can Br Colum | not established | |
| 1970 - 1979 | Former USSR (Neva River) | Finland | established | some |
| 1975 - 1980 | Iceland | Kerguelen Is. | established | probably some |
| 1975 - 1980 | UK | Kerguelen Is. | established | probably some |
| 1985 - 1987 | Norway | Iceland | probably not established | probably none |
| 1988 - 1989 | Norway | Turkey | not established | probably none |
| 1975 - 1980 | Denmark | Kerguelen Is. | established | probably some |
| 1864 - 1910 | UK | New Zealand | established | probably none |
| 1864 - 1870 | USA | Australia | established | |
| 1866 | Unknown | Italy | not established | |
| 1896 | UK Scotland | South Africa | not established | |
| 1904 | Canada | Argentina | established | |
| 1929 | Netherlands | Indonesia | not established | |
| 1935 | Germany | Chile | established | |
| 1935 | Unknown | Portugal | probably not established | probably none |
| 1957 | USA | Brazil | not established | |
| 1960 | North America | India | probably not established | unknown |
| 1960 | UK | Falkland Islands (Malvinas) | not established | |
| 1960 | UK | Kerguelen Island | not established | |
| 1971 | USA | Cyprus | not established | |
| 1982 | Norway | Jordan River | not established | |
| 1984 | Scotland | Rivers Asón and Nansa | unknown | |
| 1987 | North America | UK | established | unknown |
| 2001 | United States of America | China | unknown | no data |