[n = 31]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | Tanzania | established | |
| unknown | Unknown | Vietnam | unknown | |
| unknown | Unknown | Slovakia | probably not established | |
| unknown | Unknown | Mauritius | unknown | |
| unknown | North America | France | not established | |
| unknown | Washington State, USA | British Columbia | established | |
| unknown | unknown | Canada | probably established | some |
| unknown | Unknown | Austria | probably not established | |
| 1887 - 1895 | Germany | Norway | not established | |
| 1878 - 1890 | USA | UK | not established | unknown |
| 1873 | USA | Belgium | established | probably some |
| 1880 | USA | Germany | probably established | |
| 1889 | Unknown | Czech Republic | not established | no data |
| 1890 | USA | Sweden | not established | |
| 1890 | Germany | Sweden | not established | |
| 1893 | Sweden | Finland | not established | unknown |
| 1893 | Germany | Finland | not established | unknown |
| 1893 | Canada | Finland | not established | unknown |
| 1925 | North America | Lake Ashinoko | established | unknown |
| 1937 | USA | South Africa | established | some |
| 1938 | South Africa | Swaziland | not established | |
| 1942 | South Africa | Zimbabwe | not established | |
| 1947 | South Africa | Zambia | probably not established | |
| 1953 | California, USA | Hawaii | established | |
| 1958 | Canada | Denmark | not established | |
| 1962 | Unknown | Guam | not established | |
| 1962 | Unknown | Fiji | not established | |
| 1969 | USA | Belize | probably established | |
| 1973 | USA | South Korea | unknown | |
| 1975 | USA | Mexico | established | |
| 1984 | USA | Netherlands | not established |