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#4 Most UNWANTED AIS
Rusty Crayfish
Rusty crayfish were discovered in a tributary to the North Platte River in Wyoming in 2006. Eradication efforts were conducted and no other populations had been found for several years post-treatment. Unfortunately, rusty crayfish were once again detected in this area in 2012. Treatments were conducted in 2012 and will be completed in 2013 to remove this invasive species from the drainage.
Origin: Eastern United States
Distribution: Found in Wagonhound Creek in Wyoming. They are found throughout the United States, most recently in Colorado.
Impacts: These crayfish are voracious and out-compete natives and reduce plant diversity and abundance.
Dispersal: They are spread unintentionally through baitfish introduction or by illegal introductions.
Characteristics: Rusty spots on carapace, size up to 4 in, large, robust, smooth claws, claws gray-green or red-brown.
Additional Rusty Crayfish Information
Rusty Crayfish (Info Sheet)
If you see this crayfish in Wyoming waters, please report it to
1-877-WGFD-AIS or ReportAIS@wyo.gov
1-877-WGFD-AIS or ReportAIS@wyo.gov