• Wizard Island

    Crater Lake

    National Park Oregon

There are park alerts in effect.
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  • 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 »

  • 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 »

Monitoring the Fish of Crater Lake

Rainbow trout from Crater Lake

A Rainbow Trout caught in Crater Lake.

NPS

Crater Lake contains kokanee salmon and rainbow trout

  • the introduction of these fish is the greatest human impact on Crater Lake
  • Kokanee exhibit a boom and bust cycle in abundance over about a ten year
    • when the kokanee are abundant certain zooplankton become scarce due to predation
    • the kokanee "eat themselves out of house and home"
  • kokanee vary widely in size and maturity during the boom/bust cycles
    • when the zooplankton prey is scarce size is reduced and fewer reach maturity

Did You Know?

Did You Know?

At 1,943 feet deep, Crater Lake is the deepest lake in the United States and one of the ten deepest lakes in the world!