skip to Main Content

Aquatic Invasive Species

Not Just for Watercrafts!

For more information on Invasive Species in Montana – Partners and Resources | Montana Invasive Species (

Aquatic Invasive Species (AIS) – Plants, animals, or pathogens that are not native to Montana and can cause harm to our environment and economy.

  1. Why are they dangerous?
    • They can reproduce quickly and spread rapidly because there are no natural predators or competitors to keep them in check.
    • AIS can displace native species, clog waterways, impact irrigation and power systems, degrade ecosystems, threaten recreational fishing opportunities, and cause wildlife and public health problems.
  2. How do I prevent them from spreading?
    • Clean – Completely remove all mud, water and vegetation before leaving access area.
      • Cleaning will remove visible large-bodied organisms attached to or in watercraft or recreational equipment.
      • Water at least 120°F is recommended; be sure to avoid contact with skin and check manufacturers’ recommendations to ensure equipment can withstand high temperatures.
    • Drain – All water from watercraft and equipment.
    • Dry – Your watercraft and equipment.  Aquatic invaders can survive only in water and wet areas.
      • Dry your watercraft and fishing equipment thoroughly; this will kill most invasive species.  The longer you keep your watercraft, trailer, waders, and other equipment outside in the hot sun, the better.
      • Drying is necessary as many organisms can survive in standing water.
      • Dry in the sun (drying times will vary) or use a towel.
  3. What is Montana doing to stop the spread?
  4. How to I report a possible Aquatic Invasive Species?
    • If you see a boat or trailer with aquatic organisms attached to it, call 1-800-TIP-MONT (1-800-847-6668) immediately.
    • If you see or suspect a new infestation of an invasive plant or animal, please save a specimen and complete the form here Report A Suspected AIS | Montana FWP (

Back To Top