WDFW LogoWashington Department of Fish & Wildlife
WDFW LogoConservation

To report an AIS
sighting or to find out
more information call

Questions or comments regarding the state's Aquatic Invasive Species and Ballast Water Management Programs may be directed to:

Allen Pleus
AIS Coordinator
(360) 902-2724

View WAC 220-12-090
Classification - Nonnative aquatic
animal species with photos

Ctenopharyngodon idella - Tripliod (Triploid Grass Carp)

Animal Fish
Family: Cyprinidae
Classification: Regulated

Triploid grass carp, which have been genetically altered to make them sterile, may be introduced (with a permit from WDFW) to control aquatic weeds. There are guidelines for introducing them. As mentioned before, the fish will uproot and eat most aquatic vegetation, and do not preferentially target nuisance species such as milfoil. They are a long-lived fish that gets quite large.