| Year / Period | From | To | Established | Ecological effects |
|---|---|---|---|---|
| unknown | Not specified | Ireland | yes | |
| 1930 - 1939 | New Zealand | United Kingdom | yes | unknown |
| 1970 - 1979 | New Zealand. | Plymouth | probably yes | unknown |
| 1985 | New Zealand | Norway | yes | |
| 1997 | Southern Pacific. | North Sea. | unknown | yes |