• Wizard Island

    Crater Lake

    National Park Oregon

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  • Vehicle-Free Days on East Rim Drive

    The park will host two vehicle-free days on East Rim Drive, September 20 and 27, 2014. Although East Rim Drive will be closed for these events, all other roads through the park will remain open to vehicular traffic. More »

  • Lost Creek Campground CLOSED Nights of 9/19 and 9/26

    Lost Creek Campground will be CLOSED from 3:00 PM Friday, 9/19 until 5:00 PM Saturday, 9/20 because of the temporary road closure to vehicles on East Rim Drive. It will also be CLOSED from 3:00 PM Friday, 9/26 until 5:00 PM Saturday, 9/27.

  • Stage 1 Fire Restrictions in Effect

    To ensure public safety and to provide the highest degree of protection to park resources, restrictions on campfires, smoking, and fireworks are in effect. More »

Where are Crayfish found in Crater Lake?

The figure shows the locations where newts and crayfish are found in Crater Lake.

Locations in Crater Lake where Mazama Newts and Signal Crayfish are found.  Red circles represent crayfish locations and blue circles represent newt locations.  Larger circles indicate more individuals.

NPS

The figure shows the locations of newts (blue dots) and crayfish (red dots) in Crater Lake. Newts and crayfish rarely inhabit the same locations because the crayfish are aggressive and drive the newts away, or eat them.

  • Crayfish were introduced by humans in 1914,
  • Newts may have naturally colonized the lake as early as 6,000 years ago,
  • Over the past 100 years crayfish may have reduced newts distribution by 50%,
  • Crayfish may have the potential to eliminate newts from Crater Lake.

 
At what depth are crayfish found in Crater Lake

Figure showing the depths signal crayfish are found in Crater Lake.

NPS

This figure shows how deep signal crayfish are found in Crater Lake.

  • The deepest crayfish collected were at 820 feet!
  • 60% of the crayfish were trapped between the lake surface and 164 feet.

Why is it important to know the depths were crayfish live?

  • Park managers may want to crayfish populations to protect the Mazama Newt,
  • Knowledge of the shoreline locations where crayfish live, and how deep they live, will help managers understand the impact of crayfish to other plants and animals in the lake.

Did You Know?

Did You Know?

Algaphogopsis, also known as the Crater Lake Mite, is a microscopic animal that lives in the waters of Crater Lake.