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Bull trout life history, genetics, habitat needs, and limiting factors in central and northeast Oregon, Annual Report 1997.

DE2001781123

Publication Date	2001
Personal Author	Hemmingsen, A. R.; Gunckel, S. L.
Page Count	43
Abstract	For restoration and protection of bull trout habitats, conservation strategies depend on determining the distribution of bull trout. However, that distribution may vary seasonally depending on the age and life history type of the fish. Most juvenile bull trout distributions in Oregon have been determined during summer, and consequently, little is known about the distributions and movements of bull trout of any life stage during other seasons. Most bull trout life history information comes from fluvial or adfluvial populations (Pratt 1992; Ratliff 1992). Evidence of migratory fish is minimal or lacking for many bull trout populations in Oregon and the Columbia Basin, and they are assumed to be resident forms. Knowledge of life history patterns, in addition to aiding habitat management, also has important implications for gene conservation. Migratory life histories are vital for the resilience of bull trout metapopulations (Rieman and McIntyre 1993; Dunham et al. 1997). If migratory forms are identified, their maintenance and persistence are dependent on protection of all habitats along migratory corridors.
Keywords	Habitat Oregon Trout Genetics Natural resources Fishes Bonneville power administration Progress report
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125

Bull trout life history, genetics, habitat needs, and limiting factors in central and northeast Oregon, Annual Report 1997.

Bull trout life history, genetics, habitat needs, and limiting factors in central and northeast Oregon, Annual Report 1997.
DE2001781123

Publication Date	2001
Personal Author	Hemmingsen, A. R.; Gunckel, S. L.
Page Count	43
Abstract	For restoration and protection of bull trout habitats, conservation strategies depend on determining the distribution of bull trout. However, that distribution may vary seasonally depending on the age and life history type of the fish. Most juvenile bull trout distributions in Oregon have been determined during summer, and consequently, little is known about the distributions and movements of bull trout of any life stage during other seasons. Most bull trout life history information comes from fluvial or adfluvial populations (Pratt 1992; Ratliff 1992). Evidence of migratory fish is minimal or lacking for many bull trout populations in Oregon and the Columbia Basin, and they are assumed to be resident forms. Knowledge of life history patterns, in addition to aiding habitat management, also has important implications for gene conservation. Migratory life histories are vital for the resilience of bull trout metapopulations (Rieman and McIntyre 1993; Dunham et al. 1997). If migratory forms are identified, their maintenance and persistence are dependent on protection of all habitats along migratory corridors.
Keywords	Habitat Oregon Trout Genetics Natural resources Fishes Bonneville power administration Progress report
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bonneville Power Administration, Portland, OR.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200125