Status of Oregon's Bull Trout.

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Limited historical references indicate that bull trout Salvelinus confluentus in Oregon were once widely spread throughout at least 12 basins in the Klamath River and Columbia River systems. No bull trout have been observed in Oregon's coastal systems. A total of 69 bull trout populations in 12 basins are currently identified in Oregon. A comparison of the 1991 bull trout status (Ratliff and Howell 1992) to the revised 1996 status found that 7 populations were newly discovered and 1 population showed a positive or upgraded status while 22 populations showed a negative or downgraded status. The general downgrading of 32% ... continued below

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185 pages

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Buchanan, David V.; Hanson, Mary L. & Hooton, Robert M. October 1, 1997.

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Description

Limited historical references indicate that bull trout Salvelinus confluentus in Oregon were once widely spread throughout at least 12 basins in the Klamath River and Columbia River systems. No bull trout have been observed in Oregon's coastal systems. A total of 69 bull trout populations in 12 basins are currently identified in Oregon. A comparison of the 1991 bull trout status (Ratliff and Howell 1992) to the revised 1996 status found that 7 populations were newly discovered and 1 population showed a positive or upgraded status while 22 populations showed a negative or downgraded status. The general downgrading of 32% of Oregon's bull trout populations appears largely due to increased survey efforts and increased survey accuracy rather than reduced numbers or distribution. However, three populations in the upper Klamath Basin, two in the Walla Walla Basin, and one in the Willamette Basin showed decreases in estimated population abundance or distribution.

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185 pages

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  • Other Information: PBD: 1 Oct 1997

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  • October 1, 1997

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • July 5, 2016, 2:24 p.m.

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Buchanan, David V.; Hanson, Mary L. & Hooton, Robert M. Status of Oregon's Bull Trout., report, October 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc738544/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.