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 |
|---|---|---|---|
| Tokyo Daruma pond frog (Rana porosa) | Amphibians | Ranidae | Prohibited |
| Triploid Grass Carp (Ctenopharyngodon idella - Tripliod) | Fish | Cyprinidae | Regulated |
| Tropical Clawed frog (Silurana tropicalis) | Amphibians | Pipidae | Prohibited |
| Tsinpa salamander (Pseudohynobius tsinpaensis) | Amphibians | Hynobiidae | Prohibited |
| Tsushima Brown frog (Rana tsushimensis) | Amphibians | Ranidae | Prohibited |
| Varaldi's Spadefoot toad (Pelobates varaldii) | Amphibians | Pelobatidae | Prohibited |
| Varnish clam (Nuttallia obscurata) | Molluscs | Psammobiidae | Regulated |
| Vase tunicate (Ciona intestinalis) | Tunicate/Sea-squirt | Cionidae | Unlisted |
| Walking catfish (Clarias batrachus) | Fish | Clariidae | Prohibited |
| Western Chinese Mountain salamander (Batrachuperus pinchonii) | Amphibians | Hynobiidae | Prohibited |
| Western Spadefoot toad (Pelobates cultripes) | Amphibians | Pelobatidae | Prohibited |
| Western Spadefoot toad (Spea hammondii) | Amphibians | Pelobatidae | Prohibited |
| Wild Goldfish (Carassius auratus) | Fish | Cyprinidae | Regulated |
| Wood frog (Rana nigrolineata) | Amphibians | Ranidae | Prohibited |
| Wood turtle (Clemmys insculpta) | Reptiles | Emydidae | Prohibited |
| Wrinkled frog (Rana rugosa) | Amphibians | Ranidae | Prohibited |
| Wushan salamander (Liua shihi) | Amphibians | Hynobiidae | Prohibited |
| Yabby (Cherax albidus) | Crustaceans | Parastacidae | Prohibited |
| Yabby (Cherax preissii) | Crustaceans | Parastacidae | Prohibited |
| Yabby (Cherax rotundus setotus) | Crustaceans | Parastacidae | Prohibited |
| Yarra crayfish (Euastacus yarraensis) | Crustaceans | Parastacidae | Prohibited |
| Yellow-spotted salamander (Pseudohynobius flavomaculatus) | Amphibians | Hynobiidae | Prohibited |
| Zebra mussel (Dreissena polymorpha) | Molluscs | Dreissenidae | Prohibited |
| Zhangcun frog (Rana zhengi) | Amphibians | Ranidae | Prohibited |
| Zhaoping Treefrog (Hyla zhaopingensis) | Amphibians | Hylidae | Prohibited |