Kenneth Tiffan
Snake River fall Chinook salmon were listed as “threatened” under the ESA in 1992. My entire career has focused conducting applied research to provide information that would increase our understanding of this unique stock and facilitate recovery efforts.
The work of myself and colleagues from other agencies have produced most of the contemporary information on Snake River fall Chinook salmon.
Research Interests:
The main focus of my work is understanding Snake River fall Chinook salmon life history and ecology to support recovery of this listed stock. Over the years research topics have included migratory behavior, habitat use and quantification, physiology, and feeding ecology of juvenile fish in the Snake and Columbia rivers. Other research areas have included understanding the effects of elevated flows on chum salmon spawning behavior, and investigating recent food web changes to lower Snake River reservoirs.
Professional Experience
1992 to Present – Research Fish Biologist, U.S. Geological Survey, Western Fisheries Research Center, Columbia River Research Laboratory, Cook, WA
Education and Certifications
M.S. 1992. Fishery Biology, Colorado State University, Fort Collins, CO
B.S. 1987. Fishery Biology, Colorado State University, Fort Collins, CO
Science and Products
Post-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River. Annual report 2000-2001
Thermal exposure of juvenile fall chinook salmon migrating through a lower Snake River Reservoir
Quantifying flow-dependent changes in subyearling fall chinook salmon rearing habitat using two-dimensional spatially explicit modeling
Comparison of subyearling fall chinook salmon's use of riprap revetments and unaltered habitats in Lake Wallula of the Columbia river
Spatial, temporal, and community dynamics of zooplankton in McNary and John Day Reservoirs
Early life history attributes and run composition of PIT-tagged wild subyearling Chinook salmon recaptured after migrating downstream past Lower Granite Dam
Post-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River
Pre-dredging assessment of Messner Cove, Port of Morrow, Oregon on benthic invertebrate community and subyearling Chinook salmon rearing habitat. 1999 Final report
Identification of juvenile fall versus spring chinook salmon migrating through the lower Snake River based on body morphology
Physiological development and migratory behavior of subyearling fall chinook salmon in the Columbia River
Identification of the spawning, rearing, and migratory requirements of fall Chinook salmon in the Columbia River Basin. Annual report 1996-1997
Post-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River
Science and Products
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Filter Total Items: 109
Post-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River. Annual report 2000-2001
Abstract not availableAuthorsK.F. Tiffan, D.W. Rondorf, W.P. ConnorThermal exposure of juvenile fall chinook salmon migrating through a lower Snake River Reservoir
Impoundment of the Snake River, Washington, has resulted in high water temperatures and late seaward migration of juvenile fall chinook salmon during summer months. To determine if juvenile fall chinook salmon are exposed to temperatures higher than the upper incipient lethal, we tagged groups of fish with temperature-sensing radio tags and tracked them in Little Goose Reservoir on the Snake RiverAuthorsK.F. Tiffan, C. A. Haskell, D.W. RondorfQuantifying flow-dependent changes in subyearling fall chinook salmon rearing habitat using two-dimensional spatially explicit modeling
We used an analysis based on a geographic information system (GIS) to determine the amount of rearing habitat and stranding area for subyearling fall chinook salmon Oncorhynchus tshawytscha in the Hanford Reach of the Columbia River at steady-state flows ranging from 1,416 to 11,328 m3/s. High-resolution river channel bathymetry was used in conjunction with a two-dimensional hydrodynamic model toAuthorsK.F. Tiffan, R.D. Garland, D.W. RondorfComparison of subyearling fall chinook salmon's use of riprap revetments and unaltered habitats in Lake Wallula of the Columbia river
Subyearling fall chinook salmon's Oncorhynchus tshawytscha use of unaltered and riprap habitats in Lake Wallula of the Columbia River was determined with point abundance data collected by electrofishing in May 1994 and 1995. We documented the presence or absence of subyearlings at 277 sample sites and collected physical habitat information at each site. Based on logistic regression, we found thatAuthorsR.D. Garland, K.F. Tiffan, D.W. Rondorf, L.O. ClarkSpatial, temporal, and community dynamics of zooplankton in McNary and John Day Reservoirs
Abstract not availableAuthorsC. A. Haskell, D.W. Rondorf, K.F. TiffanEarly life history attributes and run composition of PIT-tagged wild subyearling Chinook salmon recaptured after migrating downstream past Lower Granite Dam
Seaward migration timing of Snake River fall chinook salmon (Oncorhynchus tshawytscha) smolts is indexed using subyearling chinook salmon passage data collected at Lower Granite Dam. However, not all of the subyearlings are fall chinook salmon. For six years, we recaptured wild subyearling chinook salmon smolts, which had been previously PIT tagged in the Snake River, to genetically determine if tAuthorsW.P. Connor, T.C. Bjornn, H.L. Burge, A.R. Marshall, H.L. Blankenship, R.K. Steinhorst, K.F. TiffanPost-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River
Abstract not availableAuthorsK.F. Tiffan, D.W. Rondorf, H.L. BurgePre-dredging assessment of Messner Cove, Port of Morrow, Oregon on benthic invertebrate community and subyearling Chinook salmon rearing habitat. 1999 Final report
Abstract not availableAuthorsC. A. Haskell, K.F. Tiffan, D.W. RondorfIdentification of juvenile fall versus spring chinook salmon migrating through the lower Snake River based on body morphology
We tested the use of body morphology to distinguish among subyearling fall-run, subyearling spring-run, and yearling spring-run smolts of chinook salmon Oncorhynchus tshawytscha at two lower Snake River dams during the summer emigration. Based on principal-components analysis, subyearling fall-run chinook salmon had smaller heads and eyes, deeper bodies, and shorter caudal peduncles than yearlingAuthorsK.F. Tiffan, D.W. Rondorf, R.D. Garland, P.A. VerheyPhysiological development and migratory behavior of subyearling fall chinook salmon in the Columbia River
We describe the migratory behavior and physiological development of subyearling fall chinook salmon Oncorhynchus tshawytscha migrating through John Day Reservoir on the Columbia River, Washington and Oregon. Fish were freeze-branded and coded-wire-tagged at McNary Dam, Oregon, from 1991 to 1994, to determine travel time to John Day Dam and subsequent adult contribution. Stepwise multiple regressioAuthorsK.F. Tiffan, D.W. Rondorf, P.G. WagnerIdentification of the spawning, rearing, and migratory requirements of fall Chinook salmon in the Columbia River Basin. Annual report 1996-1997
Abstract not availableAuthorsK.F. Tiffan, D.W. Rondorf, W.P. Connor, H.L. BurgePost-release attributes and survival of hatchery and natural fall Chinook salmon in the Snake River
Abstract not availableAuthorsK.F. Tiffan, D.W. Rondorf, H.L. Burge - News