| Annelids-Polychaetes | Alitta succinea | 1976 | Definite | Established | Hull Fouling, Oyster Accidental |
| Algae | Campylaephora kondoi* | 1998 | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Crabs | Carcinus maenas | 1998 | Definite | Established | Ballast Water, Discarded Bait, Hull Fouling, Natural Dispersal |
| Algae | Gracilaria vermiculophylla | 2017 | Definite | Established | Oyster Accidental |
| Crustaceans-Amphipods | Grandidierella japonica | 1999 | Definite | Established | Hull Fouling, Natural Dispersal, Oyster Accidental |
| Crustaceans-Amphipods | Monocorophium insidiosum | 2003 | Definite | Established | None |
| Mollusks-Bivalves | Nuttallia obscurata | 2003 | Definite | Established | Fisheries Accidental (not Oyster), Natural Dispersal |
| Mollusks-Gastropods | Ocinebrellus inornatus | 1934 | Definite | Established | Oyster Accidental |
| Crustaceans-Isopods | Orthione griffenis | 2006 | Definite | Established | Discarded Bait, Natural Dispersal |
| Annelids-Polychaetes | Pseudopolydora cf. kempi | 1976 | Definite | Established | Oyster Accidental |
| Annelids-Polychaetes | Pseudopolydora paucibranchiata | 1976 | Definite | Established | Oyster Accidental |
| Mollusks-Bivalves | Ruditapes philippinarum | 1965 | Definite | Established | Fisheries Intentional |
| Algae | Sargassum muticum | 1976 | Definite | Established | Hull Fouling, Natural Dispersal, Oyster Accidental |
| Crustaceans-Tanaids | Sinelobus cf. stanfordi | 2003 | Definite | Established | None |