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 |
|---|---|---|---|
| Nutria (Myocastor coypus) | Mammals | Myocastoridae | Prohibited |
| Oki salamander (Hynobius okiensis) | Amphibians | Hynobiidae | Prohibited |
| Olm (Proteus anguinus) | Amphibians | Proteidae | Prohibited |
| Omei brown frog (Rana omeimontis) | Amphibians | Ranidae | Prohibited |
| Orange fingered Yabby (Cherax depressus) | Crustaceans | Parastacidae | Prohibited |
| Orange fingered Yabby (Cherax destructor) | Crustaceans | Parastacidae | Prohibited |
| Paghman Mountain salamander (Batrachuperus mustersi) | Amphibians | Hynobiidae | Prohibited |
| Palmate newt (Triturus helveticus helveticus) | Amphibians | Salamandridae | Prohibited |
| Patterned Anthurid (Mesanthura astelia) | Crustaceans | Anthuridae | Regulated |
| Perezs frog (Rana perezi) | Amphibians | Ranidae | Prohibited |
| Persia Mountain salamander (Batrachuperus persicus) | Amphibians | Hynobiidae | Prohibited |
| Plains spadefoot toad (Spea bombifrons) | Amphibians | Pelobatidae | Prohibited |
| Pond slider (Trachemys scripta) | Reptiles | Emydidae | Regulated |
| Pool frog (Rana lessonae) | Amphibians | Ranidae | Prohibited |
| Pritchard's Pond turtle (Mauremys pritchardi) | Reptiles | Emydidae | Prohibited |
| Pyrenean Brook salamander (Euproctus asper) | Amphibians | Salamandridae | Prohibited |
| Pyrenean frog (Rana pyrenaica) | Amphibians | Ranidae | Prohibited |
| Quagga mussel (Dreissena bugensis) | Molluscs | Dreissenidae | Prohibited |
| Red piranha (Rooseveltiella nattereri) | Fish | Characidae | Prohibited |
| Red swamp crawfish (Procambarus clarkii) | Crustaceans | Cambaridae | Prohibited |
| Red-bellied newt (Taricha rivularis) | Amphibians | Salamandridae | Prohibited |
| Red-Bellied piranha (Pygocentrus nattereri) | Fish | Characidae | Prohibited |
| Reeve's turtle (Chinemys reevesii) | Reptiles | Emydidae | Prohibited |
| Ringed crayfish (Orconectes neglectus) | Crustaceans | Cambaridae | Prohibited |
| Rough Shore crab (Cyclograpsus granulosus) | Crustaceans | Grapsidae | Regulated |