| Mollusks-Gastropods | Assiminea parasitologica | 2009 | Definite | Established | Ballast Water, Fisheries Accidental (not Oyster), Hull Fouling |
| Crustaceans-Crabs | Carcinus maenas | 1998 | Definite | Established | Ballast Water, Discarded Bait, Natural Dispersal |
| Cnidarians-Hydrozoans | Cordylophora caspia | 1968 | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Amphipods | Grandidierella japonica | 1997 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal, Oyster Intentional |
| Annelids-Polychaetes | Hediste diadroma | 2014 | Definite | Established | Ballast Water, Natural Dispersal |
| Crustaceans-Amphipods | Melita nitida | 1987 | Definite | Established | Ballast Water, Hull Fouling, Oyster Intentional |
| Mollusks-Bivalves | Mya arenaria | 1943 | Definite | Established | Fisheries Intentional |
| Mollusks-Gastropods | Myosotella myosotis | 1978 | Definite | Established | Cargo, Dry Ballast, Oyster Accidental |
| Mollusks-Bivalves | Nuttallia obscurata | 2003 | Definite | Established | Fisheries Accidental (not Oyster), Natural Dispersal |
| Crustaceans-Isopods | Orthione griffenis | 2005 | Definite | Established | Discarded Bait, Natural Dispersal |
| Mollusks-Gastropods | Potamopyrgus antipodarum | 2007 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal |