• 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 »

Bull Trout - Brook Trout Hybridization

bull trout brook trout hybrid

Bull Trout hybrid in Sun Creek.


Bull Trout - Brook Trout Hybrids

Bull Trout (Salvelinus confluentus) belong to fish collectively known as char that includes:

  • Arctic Char (S. alpinus)
  • White-Spotted Char (S. leucomaenis)
  • Dolly Varden (S. malma)
  • Lake Trout (S. namaycush)
  • Brook Trout (S. fontinalis)

Bull Trout native to:

  • western North America
  • northern California
  • Nevada
  • through areas of Canada

Brook Trout are native to eastern North America, but have been stocked in rivers and streams throughout the western United States, including many within the range of Bull Trout.

Bull Trout and Brook Trout when they co-occur

  • they often spawn together
  • produce hybrid offspring

Genetic evidence from hybrid populations suggests

  • hybrids are almost always sterile
  • hybrids cannot produce offspring of their own
  • hybrid DNA are not passed on to future generations
  • has caused dramatic declines of Bull Trout in many streams including Sun Creek
bull trout and brook trout hybrids
Bull Trout - Brook Trout Hybrid from Sun Creek.

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.