| Mollusks-Gastropods | Batillaria attramentaria | 1996 | Definite | Established | Oyster Accidental |
| Crustaceans-Crabs | Carcinus maenas | 1993 | Definite | Established | Discarded Bait, Natural Dispersal |
| Bryozoans | Cryptosula pallasiana | 2006 | Definite | Established | Hull Fouling, Oyster Accidental |
| Cnidarians-Anthozoans | Diadumene lineata | 1956 | Definite | Established | Oyster Accidental |
| Tunicates | Didemnum vexillum | 2010 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling, Oyster Accidental |
| Crustaceans-Amphipods | Grandidierella japonica | 1972 | Definite | Established | Natural Dispersal, Oyster Accidental |
| Fishes | Morone saxatilis | 1890 | Definite | Established | Natural Dispersal |
| Mollusks-Bivalves | Mya arenaria | 1919 | Definite | Established | Fisheries Intentional |
| Crustaceans-Copepods | Mytilicola orientalis | 1967 | Definite | Established | Oyster Accidental |
| Annelids-Polychaetes | Polydora cornuta | 1933 | Definite | Established | Hull Fouling, Oyster Accidental |
| Mollusks-Gastropods | Potamopyrgus antipodarum | 2014 | Definite | Established | Fisheries Accidental (not Oyster), Natural Dispersal |
| Bryozoans | Schizoporella japonica | 2006 | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Shrimp | Upogebia major | 2014 | Definite | Established | Discarded Bait, Fisheries Accidental (not Oyster), Natural Dispersal |
| Bryozoans | Watersipora subatra* | 1984 | Definite | Established | Hull Fouling, Oyster Accidental |