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Prevent Spread of Rusty Crayfish

Transport of crayfish is prohibited.

Rusty crayfish, an aggressive invasive species native to the Ohio River basin in the upper Midwest, have been discovered in the headwaters of the Yampa River and the Sanchez Reservoir State Wildlife Area in Costilla County. To prevent the spread of rusty crayfish, an order prohibiting the removal of any live crayfish was established in 2010.

rusty crayfish

The discovery of rusty crayfish in the Yampa basin is the first time this species has been found in Colorado, though human activity has moved rusty crayfish throughout the northeast and into southern Canada. Because of their larger size and more aggressive nature, rusty crayfish can impact fish populations by consuming small fish and fish eggs. Rusty crayfish can also negatively impact fish and spread unwanted aquatic plants by aggressively harvesting underwater plant beds.

Identification of rusty crayfish is extremely difficult and generally requires analysis of mature males. Anglers gathering crayfish must either immediately return the live crayfish to the water where it was captured or immediately kill the crayfish by separating the edible tail portion from the body of the crayfish. 

Anyone with questions or comments about rusty crayfish can contact Elizabeth Brown, Aquatic Nuisance Species Coordinator, at (303) 291-7362. To learn more about rusty crayfish and the order prohibiting removal, see Aggressive Opportunistic Feeders.

Give Wildlife Some Space in Spring

Help Keep Wildlife Safe this Spring

Spring can be difficult for Colorado's wildlife and the best way to help is by keeping your distance. 

Food sources aren't fully replenished, which means wildlife still need to conserve energy to survive. Human activities can displace animals into less desirable habitats and cause them to burn precious calories. It’s a good idea to avoid areas where wildlife are concentrated. Keep dogs on leashes and confine recreation and off road vehicles to designated trails and roadways.

White Tail Deer FawnIt's also important to leave baby animals alone, even if they appear to be abandoned. For example, deer fawns and elk calves are born with natural camouflage and a lack of scent. In the first few days of their lives, the newborns are not mobile enough to travel with their mothers. As a defensive tactic, the mothers will often leave the young animals alone for long periods of time. During this crucial period the mothers will still visit the newborns at least twice a day to feed them. After a few days, the fawns and calves are usually strong enough to join the herd.

If you are concerned about an animal, don't touch it and contact your local CPW office. For more information about encountering wildlife, see Living With Wildlife.