National Invasive Species Information Center
U.S. Department of Agriculture

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Displaying 81 to 84 of 84

  • Top Invasive Concerns: Rusty Crayfish

    • Colorado Parks and Wildlife.

    • The Colorado Division of Wildlife is monitoring the state's waters for the introduction of an aggressive invasive species, the rusty crayfish. Rusty crayfish were found for the first time in Colorado during routine sampling operations in 2009 in the Yampa River drainage between Steamboat Springs and the town of Yampa. Because of their larger size and more aggressive nature, rusty crayfish can impact fish populations by consuming small fish and fish eggs, and negatively impact fish and spread unwanted aquatic plants by aggressively harvesting underwater plant beds. Learn more how to identify the rusty crayfish, how to stop the spread and how to report sightings.

  • Viral Hemorrhagic Septicemia: A Threat to Colorado's Fish [PDF, 689 KB]

  • Weed Management

    • La Plata County (Colorado).

  • Zebra and Quagga Mussels

    • Colorado Parks & Wildlife.