Rusty crayfish cause a variety of negative impacts when introduced to new waters, including displacing native animals and plants. For more information on this topic, click here to connect to the Colorado Division of Wildlife website. New Zealand mudsnail (Potamopyrgus antipodarum) The rusty crayfish (Faxonius rusticus)is a large, aggressive species of freshwater crayfish which is native to the United States. ... Illinois, Wisconsin, Michigan, Minnesota, Iowa, Missouri, Ohio ...Steamboat Springs — The invasion of rusty crayfish in the Yampa River has led the Division of Wildlife to issue an order that prohibits taking live crawfish from the Yampa and its tributaries.. Rusty crayfish, a nonnative species that biologists say are more aggressive than native crawfish, were found at several sites along the Yampa River last year and early this year.

Explain why the fact that invasive species did not co-evolve with the native species unbalances an ecosystem. ... The rusty crayfish is harmful to native species of ... To prevent the spread of rusty crayfish, an immediate order prohibits the removal of any live crayfish from Sanchez Reservoir State Wildlife Area and from the Yampa River, and any streams, lakes, canals or rivers that adjoin the Yampa River. Colorado law prohibits the use of rusty crayfish as bait anywhere in the state.