| Nematodes | Anguillicola crassus* | 2005 | Definite | Established | Fisheries Accidental (not Oyster), Natural Dispersal |
| Bryozoans | Bugulina simplex | 2010 | Definite | Established | Hull Fouling |
| Crustaceans-Amphipods | Caprella mutica | 2010 | Definite | Established | Hull Fouling, Natural Dispersal |
| Algae | Colpomenia peregrina* | 2017 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal |
| Platyhelminthes | Cryptocotyle lingua* | 1972 | Definite | Established | Dry Ballast, Fisheries Accidental (not Oyster), Fisheries Intentional, Hull Fouling, Natural Dispersal |
| Algae | Dasysiphonia japonica | 2009 | Definite | Established | Ballast Water, Hull Fouling |
| Cnidarians-Anthozoans | Diadumene lineata | 2000 | Definite | Established | Hull Fouling |
| Algae | Gracilaria vermiculophylla | 2009 | Definite | Established | Hull Fouling, Natural Dispersal |
| Protozoans | Haplosporidium nelsoni* | 1992 | Definite | Established | Hull Fouling, Natural Dispersal, Oyster Accidental |
| Annelids-Polychaetes | Janua heterostropha | 2022 | Definite | Established | Hull Fouling |
| Arthropoda-Insects | Lipara rufitarsis* | 2002 | Definite | Established | Aquatic Plant Shipments, Cargo, Dry Ballast |
| Arthropoda-Insects | Lipara similis* | 2002 | Definite | Established | Aquatic Plant Shipments, Cargo, Dry Ballast |
| Mollusks-Gastropods | Littorina littorea | 1897 | Definite | Established | Dry Ballast, Hull Fouling, Natural Dispersal |
| Bryozoans | Membranipora membranacea | 1990 | Definite | Established | Ballast Water, Hull Fouling, Natural Dispersal |
| Arthropoda-Insects | Nacerdes melanura* | 1909 | Definite | Established | Cargo, Hull Fouling |
| Algae | Neopyropia katadae* | 2005 | Definite | Established | Fisheries Accidental (not Oyster), Hull Fouling |
| Algae | Neopyropia koreana* | 2005 | Definite | Established | Hull Fouling |
| Algae | Neopyropia yezoensis* | 2005 | Definite | Established | Hull Fouling |
| Mollusks-Bivalves | Ostrea edulis | 1985 | Definite | Established | Oyster Intentional |
| Protozoans | Perkinsus marinus* | 1998 | Definite | Established | Oyster Accidental |
| Arthropoda-Insects | Petrobius brevistylis* | 1979 | Definite | Established | Cargo, Dry Ballast |
| Mollusks-Bivalves | Teredo navalis | 1948 | Definite | Established | Hull Fouling |
| Bryozoans | Tricellaria inopinata | 2022 | Definite | Established | Hull Fouling |