| Year / Period | From | To | Established | Ecological effects |
|---|---|---|---|---|
| 1960 - 1965 | Germany | Netherlands | unknown | unknown |
| 1931 | North America | Fresh water bodies of Ireland | yes | yes |
| 1931 | Western North Atlantic | Britain | unknown | unknown |
| 1957 | Northwest Atlantic. | Inland waters | unknown | yes |
| 2003 | Curonian Lagoon | Kõiguste Bay | yes | probably yes |