[n = 5]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | United States of America | China | unknown | no data |
| unknown | Unknown | Schwentine River | not established | some |
| unknown | Unknown | Guam | not established | |
| unknown | Northwest Atlantic | San Francisco Bay, California | not established | |
| 1971 - 1972 | Canada | Japan | unknown |