| Tunicates | Botrylloides violaceus | 2013 | Definite | Established | Hull Fouling |
| Algae | Bryopsis maxima* | 1995 | Definite | Established | Ballast Water, Hull Fouling |
| Crustaceans-Amphipods | Caprella mutica | 2013 | Definite | Established | Hull Fouling |
| Crustaceans-Crabs | Carcinus maenas | 2003 | Definite | Established | Discarded Bait, Hull Fouling, Natural Dispersal |
| Algae | Codium fragile ssp. Fragile | 2003 | Definite | Established | Discarded Bait, Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal, Oyster Accidental |
| Algae | Gracilaria vermiculophylla | 2013 | Definite | Established | Hull Fouling |
| Crustaceans-Crabs | Hemigrapsus sanguineus | 1992 | Definite | Established | Hull Fouling, Natural Dispersal |
| Mollusks-Gastropods | Littorina littorea | 1952 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Amphipods | Microdeutopus gryllotalpa | 1972 | Definite | Established | None |
| Fishes | Micropterus salmoides | 1911 | Definite | Established | Fisheries Intentional |
| Tunicates | Styela clava | 2013 | Definite | Established | None |