| Year / Period | From | To | Established | Ecological effects |
|---|---|---|---|---|
| unknown | Not specified | Ireland | yes | |
| 1940 - 1945 | Australia | Chichester Harbour. | yes | unknown |
| 1940 - 1945 | New Zealand | Chichester Harbour. | yes | unknown |
| 1940 | Australia, New Zealand | United Kingdom | yes | unknown |
| 1953 | Southern Pacific. | North Sea. | unknown | yes |
| 1957 | Southern Pacific | Brackish and marine waters of Ireland | yes | yes |