| Bryozoans | Bugula neritina | 2009 | Definite | Established | Hull Fouling |
| Algae | Codium fragile ssp. Fragile | 2000 | Definite | Established | Discarded Bait, Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal, Oyster Accidental |
| Tunicates | Ecteinascidia turbinata | 1961 | Definite | Established | Hull Fouling |
| Algae | Gracilaria vermiculophylla | 1998 | Definite | Established | Hull Fouling, Natural Dispersal |
| Protozoans | Haplosporidium nelsoni* | 1959 | Definite | Established | Hull Fouling, Natural Dispersal, Oyster Accidental |
| Crustaceans-Crabs | Hemigrapsus sanguineus | 1994 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Isopods | Ligia exotica | 1924 | Definite | Established | Cargo, Dry Ballast |
| Mollusks-Gastropods | Littorina littorea | 1982 | Definite | Established | Hull Fouling, Natural Dispersal |
| Crustaceans-Barnacles | Loxothylacus panopaei | 1986 | Definite | Established | Oyster Accidental |
| Crustaceans-Shrimp | Lysmata vittata | 2013 | Definite | Established | None |
| Mollusks-Gastropods | Myosotella myosotis | 1972 | Definite | Established | Dry Ballast |
| Arthropoda-Insects | Nacerdes melanura* | None | Definite | Established | Cargo, Hull Fouling |
| Crustaceans-Amphipods | Stenothoe gallensis species complex | 1960 | Definite | Established | Hull Fouling |
| Mollusks-Gastropods | Stramonita canaliculata | 1955 | Definite | Established | Dry Ballast, Hull Fouling, Oyster Accidental |
| Algae | Striaria attenuata* | 1968 | Definite | Established | Hull Fouling |
| Mollusks-Bivalves | Teredo navalis | 1985 | Definite | Established | Hull Fouling |