| Tunicates | Ascidiella aspersa | 2018 | Definite | Established | Hull Fouling |
| Algae | Bonnemaisonia hamifera | 1978 | Definite | Established | Ballast Water, Hull Fouling |
| Tunicates | Botryllus schlosseri | 2011 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling |
| Tunicates | Ciona intestinalis | 2007 | Definite | Established | Hull Fouling |
| Algae | Codium fragile ssp. Fragile | 1985 | Definite | Established | Hull Fouling |
| Tunicates | Diplosoma listerianum | 2018 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling |
| Algae | Fucus serratus* | 1903 | Definite | Established | Ballast Water, Dry Ballast, Hull Fouling |
| Cnidarians-Hydrozoans | Gonionemus vertens | 2017 | Definite | Established | Ballast Water, Hull Fouling |
| Tunicates | Molgula manhattensis | 2018 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling |
| Mollusks-Bivalves | Mya arenaria | 1958 | Definite | Established | Ballast Water, Fisheries Accidental (not Oyster), Fisheries Intentional |
| Fishes | Oncorhynchus gorbuscha* | 1961 | Definite | Established | Natural Dispersal |
| Crustaceans-Amphipods | Orchestia gammarellus | 1968 | Definite | Established | Dry Ballast |
| Crustaceans-Mysids | Praunus flexuosus | 1970 | Definite | Established | Ballast Water |
| Arthropoda-Insects | Telmatogeton japonicus* | None | Definite | Established | Cargo, Hull Fouling |