| Crustaceans-Crabs | Carcinus maenas | 1976 | Non-native | Established | Ballast Water, Hull Fouling, Natural Dispersal |
| Crustaceans-Amphipods | Corophium volutator | 2011 | Non-native | Established | Ballast Water, Dry Ballast |
| Platyhelminthes | Cryptocotyle lingua* | 1972 | Non-native | Established | Dry Ballast, Fisheries Accidental (not Oyster), Fisheries Intentional, Hull Fouling, Natural Dispersal |
| Annelids-Polychaetes | Hediste diversicolor | 1963 | Non-native | Established | Dry Ballast |
| Mollusks-Gastropods | Littorina littorea | 1976 | Non-native | Established | Dry Ballast, Hull Fouling, Natural Dispersal |
| Mollusks-Bivalves | Teredo navalis | 1960 | Non-native | Established | Hull Fouling |
| Algae | Ulva australis | 2009 | Non-native | Established | Hull Fouling |