| Main Ref. | Leppakoski, E. and S. Olenin, 2000 |
| To | Sweden |
| FAO area | Atlantic, Northeast |
| From | Japan and Southeast Asia |
| FAO area | |
| Year | 1987 |
| Range | |
| Period | 1975-present |
| Established in the Wild | |
| Established in Aquaculture | |
| Significant Ecological Interactions | yes |
| Significant Socio-economic Effects | |
| Introduced by | |
| Reason | accidental |
| Other Reason | |
| Comments | It was first observed in 1987 on the Swedish west coast and has since expanded southward along the Swedsh coast and from the outer archipelago to the mainland's coastline. It compedes with native algae for light. |