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 |
|---|---|---|---|
| Levant Water frog (Rana bedriagae) | Amphibians | Ranidae | Prohibited |
| Lined leopard frog (Rana plancyi) | Amphibians | Ranidae | Prohibited |
| Long-Tailed Clawed salamander (Onychodactylus fischeri) | Amphibians | Hynobiidae | Prohibited |
| Longnose Gar (Lepisosteus osseus) | Fish | Lepisosteidae | Prohibited |
| Luristan newt (Neurergus kaiseri) | Amphibians | Salamandridae | Prohibited |
| Marbeled newt (Triturus marmoratus marmoratus) | Amphibians | Salamandridae | Prohibited |
| Marbled salamander (Ambystoma opacum) | Amphibians | Ambystomatidae | Prohibited |
| Marsh frog (Rana ridibunda) | Amphibians | Ranidae | Prohibited |
| Mediterranean Pond turtle (Mauremys leprosa) | Reptiles | Emydidae | Prohibited |
| Mediterranean Tree frog (Hyla meridionalis) | Amphibians | Hylidae | Prohibited |
| Mexican spadefoot toad (Spea multiplicata) | Amphibians | Pelobatidae | Prohibited |
| Montane Brown frog (Rana ornativentris) | Amphibians | Ranidae | Prohibited |
| Moor frog (Rana arvalis) | Amphibians | Ranidae | Prohibited |
| Mosquito fish (Gambusia affinis) | Fish | Poecilidae | Regulated |
| Murray crayfish (Euastacus armatus) | Crustaceans | Parastacidae | Prohibited |
| New Zealand mud snail (Potamopyrgus antipodarum.) | Molluscs | Gastropoda | Prohibited |
| Nile tilapia (Oreochromis niloticus) | Fish | Cichlidae | Regulated |
| Noboribetsu salamander (Hynobius retardatus) | Amphibians | Hynobiidae | Prohibited |
| North China tree frog (Hyla immaculata) | Amphibians | Hylidae | Prohibited |
| Northeastern China Hynobiid salamander (Hynobius leechii) | Amphibians | Hynobiidae | Prohibited |
| Northern crayfish (Orconectes virilus) | Crustaceans | Cambaridae | Prohibited |
| Northern Dwarf siren (Pseudobranchus striatus striatus) | Amphibians | Sirenidae | Prohibited |
| Northern green frog (Rana [Lithobates] clamitans) | Amphibians | Ranidae | Regulated |
| Northern pike (Esox lucius) | Fish | Escocidae | Prohibited |
| Northern snakehead (Channa argus) | Fish | Channidae | Prohibited |