| Crustaceans-Crabs | Carcinus maenas | 1998 | Definite | Established | Ballast Water, Discarded Bait, Hull Fouling, Natural Dispersal |
| Cnidarians-Hydrozoans | Cordylophora caspia | 1976 | Definite | Established | Hull Fouling, Oyster Accidental |
| Algae | Gracilaria vermiculophylla | 2017 | Definite | Established | Oyster Accidental |
| Crustaceans-Amphipods | Grandidierella japonica | 1996 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal, Oyster Accidental |
| Annelids-Polychaetes | Hobsonia florida | 1996 | Definite | Established | Oyster Accidental |
| Crustaceans-Amphipods | Monocorophium acherusicum | 1996 | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Amphipods | Monocorophium insidiosum | 2003 | Definite | Established | Hull Fouling |
| Mollusks-Bivalves | Mya arenaria | 1917 | Definite | Established | Fisheries Intentional |
| Mollusks-Gastropods | Myosotella myosotis | 1976 | Definite | Established | None |
| Crustaceans-Cumaceans | Nippoleucon hinumensis | 1996 | Definite | Established | None |
| Crustaceans-Isopods | Orthione griffenis | 2001 | Definite | Established | Discarded Bait, Natural Dispersal |
| Mollusks-Gastropods | Potamopyrgus antipodarum | 2007 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal |
| Crustaceans-Copepods | Pseudodiaptomus inopinus | 1991 | Definite | Established | Ballast Water |
| Annelids-Polychaetes | Pseudopolydora cf. kempi | None | Definite | Established | Hull Fouling, Oyster Accidental |
| Algae | Sargassum muticum | None | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Tanaids | Sinelobus cf. stanfordi | 2003 | Definite | Established | Ballast Water, Hull Fouling |
| Annelids-Polychaetes | Streblospio benedicti | 1996 | Definite | Established | Ballast Water, Hull Fouling |