| Main Ref. | Leppakoski, E. and S. Olenin, 2000 |
| To | Baltic Sea |
| FAO area | Europe - Inland waters |
| From | North America |
| FAO area | |
| Year | 1990 |
| Range | |
| Period | 1975-present |
| Established in the Wild | yes |
| Established in Aquaculture | |
| Significant Ecological Interactions | |
| Significant Socio-economic Effects | |
| Introduced by | |
| Reason | ballast water |
| Other Reason | |
| Comments | It has widely spread along the Finnish coast and seems to have become a permament member of the macrozoobenthos in the North Baltic. |