| Nematodes | Anguillicola crassus* | 2005 | Definite | Established | Fisheries Accidental (not Oyster), Natural Dispersal |
| Algae | Bonnemaisonia hamifera | 1980 | Definite | Established | Hull Fouling |
| Tunicates | Botrylloides violaceus | 1998 | Definite | Established | Hull Fouling |
| Crustaceans-Amphipods | Caprella mutica | 2011 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Crabs | Carcinus maenas | 2009 | Definite | Established | Dry Ballast, Hull Fouling, Natural Dispersal |
| Algae | Codium fragile ssp. Fragile | 1989 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal, Oyster Accidental |
| Algae | Colpomenia peregrina* | 2012 | Definite | Established | Hull Fouling |
| Platyhelminthes | Cryptocotyle lingua* | None | Definite | Established | Dry Ballast, Fisheries Accidental (not Oyster), Fisheries Intentional, Hull Fouling, Natural Dispersal |
| Mollusks-Nudibranchs | Doris pseudoargus | 2021 | Definite | Established | None |
| Algae | Dumontia contorta* | 1999 | Definite | Established | Hull Fouling |
| Crustaceans-Crabs | Hemigrapsus sanguineus | 2005 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Isopods | Ligia oceanica | 1953 | Definite | Established | Cargo, Dry Ballast |
| Mollusks-Gastropods | Littorina littorea | 1880 | Definite | Established | Dry Ballast, Hull Fouling, Natural Dispersal |
| Algae | Lomentaria orcadensis* | 1999 | Definite | Established | Ballast Water, Hull Fouling |
| Algae | Melanosiphon intestinalis* | 1996 | Definite | Established | Hull Fouling |
| Bryozoans | Membranipora membranacea | 1987 | Definite | Established | Ballast Water, Hull Fouling |
| Arthropoda-Insects | Nacerdes melanura* | None | Definite | Established | None |
| Arthropoda-Insects | Petrobius brevistylis* | 1963 | Definite | Established | None |
| Fishes | Salmo trutta* | None | Definite | Established | Fisheries Intentional |
| Arthropoda-Insects | Sclerocona acutella* | 2020 | Definite | Established | Natural Dispersal |
| Mollusks-Bivalves | Teredo navalis | 1960 | Definite | Established | Hull Fouling |