| Algae | Bonnemaisonia hamifera | 2007 | Definite | Established | Hull Fouling |
| Algae | Bonnemaisonia hamifera | 2013 | Definite | Established | Hull Fouling, Natural Dispersal |
| Tunicates | Botrylloides violaceus | 2004 | Definite | Established | Hull Fouling |
| Crustaceans-Amphipods | Caprella mutica | 2011 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Crabs | Carcinus maenas | 2007 | Definite | Established | Hull Fouling, Natural Dispersal |
| Algae | Colpomenia peregrina* | 2012 | Definite | Established | Hull Fouling |
| Platyhelminthes | Cryptocotyle lingua* | 2008 | Definite | Established | Dry Ballast, Fisheries Accidental (not Oyster), Fisheries Intentional, Hull Fouling, Natural Dispersal |
| Tunicates | Didemnum vexillum | 2013 | Definite | Established | Hull Fouling |
| Tunicates | Diplosoma listerianum | 2013 | Definite | Established | None |
| Crustaceans-Crabs | Hemigrapsus sanguineus | 2009 | Definite | Established | Hull Fouling, Natural Dispersal |
| Mollusks-Gastropods | Littorina littorea | 1880 | Definite | Established | Hull Fouling, Natural Dispersal |
| Algae | Melanosiphon intestinalis* | 2007 | Definite | Established | Hull Fouling |
| Bryozoans | Membranipora membranacea | 2007 | Definite | Established | Hull Fouling, Natural Dispersal |
| Mollusks-Bivalves | Ostrea edulis | 2013 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Shrimp | Palaemon elegans | 2013 | Definite | Established | Natural Dispersal |
| Crustaceans-Mysids | Praunus flexuosus | 2008 | Definite | Established | Natural Dispersal |