Aquatic invasive species (AIS) pose an ongoing threat to Washington's environment and economy. Find out which species are considered invasive in Washington.
| Species | Category | Family | AIS classification |
|---|---|---|---|
| Chain tunicate (Botrylloides violaceus) | Tunicate/Sea-squirt | Botryllidae | Unlisted |
| Clubbed Tunicate (Styela clava) | Tunicate/Sea-squirt | Styelidae | Unlisted |
| Colonial sea squirt (Didemnum vexillum) | Tunicate/Sea-squirt | Didemnidae | Unlisted |
| Eastern oyster drill (Urosalpinx cinerea) | Molluscs | Gastropoda | Unlisted |
| Golden star tunicate (Botryllus schlosseri) | Tunicate/Sea-squirt | Botryllidae | Unlisted |
| Japanese oyster drill (Ocinebrellus inornatus) | Molluscs | Gastropoda | Unlisted |
| Sea grape tunicate (Molgula manhattensis) | Tunicate/Sea-squirt | Molgulidae | Unlisted |
| Solitary sea squirt (Ciona savignyi) | Tunicate/Sea-squirt | Cionidae | Unlisted |
| Vase tunicate (Ciona intestinalis) | Tunicate/Sea-squirt | Cionidae | Unlisted |