| Taxonomic Group | Name | Year | Invasion Status | Population Status | Vectors |
|---|---|---|---|---|---|
| Tunicates | Botrylloides violaceus | 2009 | Definite | Established | Hull Fouling |
| Crustaceans-Crabs | Carcinus maenas | 2009 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal |
| Crustaceans-Amphipods | Corophium volutator | 1932 | Definite | Established | Ballast Water, Dry Ballast |
| Cnidarians-Anthozoans | Diadumene lineata | 1949 | Definite | Established | Oyster Accidental |
| Mollusks-Gastropods | Littorina littorea | 1971 | Definite | Established | Dry Ballast, Hull Fouling, Natural Dispersal |
| Arthropoda-Insects | Petrobius brevistylis* | 1979 | Definite | Established | Cargo, Dry Ballast |
| Annelids-Polychaetes | Polydora onagawaensis* | 2018 | Definite | Established | Oyster Accidental |