| Main Ref. | Carlton, J.T., 1985 |
| To | Zuiderzee, Denmark |
| FAO area | Atlantic, Northeast |
| From | Western North Atlantic |
| FAO area | Atlantic, Northwest |
| Year | 1916 |
| Range | |
| Period | 1900-1924 |
| Established in the Wild | Unknown |
| Established in Aquaculture | |
| Significant Ecological Interactions | Unknown |
| Significant Socio-economic Effects | |
| Introduced by | |
| Reason | biofouling |
| Other Reason | ballast water |
| Comments | Introduced via fouling or boring into ships' hulls and possibly via ballast water. May have also be naturally occurring in the region and not previously reported or recognized. Ref. Carlton, J.T., 1985 |