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 |
|---|---|---|---|
| Round goby (Neogobius melanostomus) | Fish | Gobiidae | Prohibited |
| Rudd (Scardinius erythropthalmus) | Fish | Cyprinidae | Prohibited |
| Rusty crayfish (Orconectes rusticus) | Crustaceans | Cambaridae | Prohibited |
| Ryukyu Brown frog (Rana okinavana) | Amphibians | Ranidae | Prohibited |
| Ryukyu Yellow Pond turtle (Mauremys mutica kami) | Reptiles | Emydidae | Prohibited |
| Sahara frog (Rana saharica) | Amphibians | Ranidae | Prohibited |
| San Chiang Tree frog (Hyla sanchiangensis) | Amphibians | Hylidae | Prohibited |
| Sand Ghost shrimp (Biffarius arenosus) | Crustaceans | Callianassidae | Regulated |
| Sea flea (Nebalia sp) | Crustaceans | Leptostraca | Regulated |
| Sea grape tunicate (Molgula manhattensis) | Tunicate/Sea-squirt | Molgulidae | Unlisted |
| Shangcheng Stout salamander (Pachyhynobius shangchengensis) | Amphibians | Hynobiidae | Prohibited |
| Shensi Tree frog (Hyla tsinlingensis) | Amphibians | Hylidae | Prohibited |
| Shiucheng salamander (Pseudohynobius shuichengensis) | Amphibians | Hynobiidae | Prohibited |
| Siberian frog (Rana altaica) | Amphibians | Ranidae | Prohibited |
| Siberian salamander (Ranodon sibiricus) | Amphibians | Hynobiidae | Prohibited |
| Siberian wood frog (Rana amurensis) | Amphibians | Ranidae | Prohibited |
| Sichuan frog (Rana shuchinae) | Amphibians | Ranidae | Prohibited |
| Sierra newt (Taricha torosa) | Amphibians | Salamandridae | Prohibited |
| Silver carp (Hypophthalmichthys molitrix) | Fish | Cyprinidae | Prohibited |
| Silver Orfe (Leuciscus idus - Silver) | Fish | Cyprinidae | Prohibited |
| Smooth newt (Triturus vulgaris lantzi) | Amphibians | Salamandridae | Prohibited |
| Smooth Softshell turtle (Apalone mutica mutica) | Reptiles | Trionychidae | Prohibited |
| Solitary sea squirt (Ciona savignyi) | Tunicate/Sea-squirt | Cionidae | Unlisted |
| Southern Crested newt (Triturus karelinii) | Amphibians | Salamandridae | Prohibited |
| Southern Rock lobster (Jasus novaehollandiae) | Crustaceans | Panuliridae | Regulated |