| Fishes | Acanthogobius flavimanus | 1967 | Definite | Established | Discarded Bait, Natural Dispersal |
| Crustaceans-Amphipods | Ampelisca abdita | 1971 | Definite | Established | Discarded Bait, Oyster Accidental |
| Crustaceans-Amphipods | Ampithoe valida | 1975 | Definite | Established | Discarded Bait, Oyster Accidental |
| Mollusks-Gastropods | Batillaria attramentaria | 1955 | Definite | Established | Oyster Accidental |
| Crustaceans-Crabs | Carcinus maenas | 1993 | Definite | Established | Discarded Bait, Natural Dispersal |
| Platyhelminthes | Cercaria batillariae* | 1998 | Definite | Established | Oyster Accidental |
| Mollusks-Bivalves | Gemma gemma | 1918 | Definite | Established | Oyster Accidental |
| Crustaceans-Isopods | Gnorimosphaeroma rayi | 2009 | Definite | Established | None |
| Algae | Gracilaria vermiculophylla | 2017 | Definite | Established | Hull Fouling, Oyster Accidental |
| Crustaceans-Amphipods | Grandidierella japonica | 1971 | Definite | Established | Natural Dispersal, Oyster Accidental |
| Annelids-Polychaetes | Heteromastus filiformis species complex | 1969 | Definite | Established | Ballast Water, Oyster Accidental |
| Crustaceans-Isopods | Iais californica | 1972 | Definite | Established | None |
| Crustaceans-Amphipods | Monocorophium acherusicum | 1969 | Definite | Established | Oyster Accidental |
| Crustaceans-Amphipods | Monocorophium insidiosum | 1969 | Definite | Established | Oyster Accidental |
| Crustaceans-Amphipods | Monocorophium uenoi | 1975 | Definite | Established | Oyster Accidental |
| Mollusks-Bivalves | Mya arenaria | 1922 | Definite | Established | Fisheries Intentional |
| Mollusks-Gastropods | Myosotella myosotis | 1975 | Definite | Established | Oyster Accidental |
| Mollusks-Bivalves | Mytilus galloprovincialis | 1987 | Definite | Established | Natural Dispersal |
| Crustaceans-Isopods | Niambia capensis | 1989 | Definite | Established | Cargo, Dry Ballast |
| Annelids-Polychaetes | Polydora cornuta | 1969 | Definite | Established | Hull Fouling, Oyster Accidental |
| Annelids-Polychaetes | Pseudopolydora cf. kempi | 1967 | Definite | Established | Oyster Accidental |
| Mollusks-Bivalves | Ruditapes philippinarum | 1966 | Definite | Established | Oyster Accidental |
| Crustaceans-Isopods | Sphaeroma quoianum | 1958 | Definite | Established | None |
| Annelids-Polychaetes | Streblospio benedicti | 1969 | Definite | Established | Oyster Accidental |
| Crustaceans-Shrimp | Upogebia major | 2014 | Definite | Established | Discarded Bait, Fisheries Accidental (not Oyster), Natural Dispersal |
| Bryozoans | Watersipora subatra* | 2015 | Definite | Established | Hull Fouling, Oyster Accidental |
| Bryozoans | Watersipora subtorquata | 2015 | Definite | Established | Hull Fouling, Natural Dispersal |