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 |
|---|---|---|---|
| Vase tunicate (Ciona intestinalis) | Tunicate/Sea-squirt | Cionidae | Unlisted |
| Nile tilapia (Oreochromis niloticus) | Fish | Cichlidae | Regulated |
| Black Chin tilapia (Sarotherodon melanotheron) | Fish | Cichlidae | Regulated |
| Alligator snapping turtle (Macrochelys temminckii) | Reptiles | Chelydridae | Prohibited |
| Common snapping turtle (Chelydra serpentina) | Reptiles | Chelydridae | Prohibited |
| Black piranha (Serrasalmus rhombeus) | Fish | Characidae | Prohibited |
| Red-Bellied piranha (Pygocentrus nattereri) | Fish | Characidae | Prohibited |
| Red piranha (Rooseveltiella nattereri) | Fish | Characidae | Prohibited |
| Northern snakehead (Channa argus) | Fish | Channidae | Prohibited |
| Fishhook waterflea (Cercopagis pengoi) | Crustaceans | Cercopagidae | Prohibited |
| Spiny waterflea (Bythotrephes cederstroemi) | Crustaceans | Cercopagidae | Prohibited |
| Red swamp crawfish (Procambarus clarkii) | Crustaceans | Cambaridae | Prohibited |
| Rusty crayfish (Orconectes rusticus) | Crustaceans | Cambaridae | Prohibited |
| Ringed crayfish (Orconectes neglectus) | Crustaceans | Cambaridae | Prohibited |
| Northern crayfish (Orconectes virilus) | Crustaceans | Cambaridae | Prohibited |
| Sand Ghost shrimp (Biffarius arenosus) | Crustaceans | Callianassidae | Regulated |
| Chain tunicate (Botrylloides violaceus) | Tunicate/Sea-squirt | Botryllidae | Unlisted |
| Golden star tunicate (Botryllus schlosseri) | Tunicate/Sea-squirt | Botryllidae | Unlisted |
| Patterned Anthurid (Mesanthura astelia) | Crustaceans | Anthuridae | Regulated |
| Three-toed Amphiuma (Amphiuma tridactylum) | Amphibians | Amphiumidae | Prohibited |
| Bowfin, Grinnel, or Mudfish (Amia calva) | Fish | Amiidae | Prohibited |
| California Tiger salamander (Ambystoma californiense) | Amphibians | Ambystomatidae | Prohibited |
| Blue-spotted salamander (Ambystoma laterale) | Amphibians | Ambystomatidae | Prohibited |
| Marbled salamander (Ambystoma opacum) | Amphibians | Ambystomatidae | Prohibited |
| Tarahumara salamander (Ambystoma rosaceum) | Amphibians | Ambystomatidae | Prohibited |