| Taxonomic Group | Name | Year | Invasion Status | Population Status | Vectors |
|---|---|---|---|---|---|
| Crustaceans-Crabs | Carcinus maenas | 1930 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal |
| Crustaceans-Crabs | Hemigrapsus sanguineus | 2005 | Definite | Established | Hull Fouling, Natural Dispersal |
| Mollusks-Gastropods | Littorina littorea | 1880 | Definite | Established | Dry Ballast, Hull Fouling, Natural Dispersal |