Kenneth Tiffan (Former Employee)
Science and Products
Filter Total Items: 114
Predicted changes in subyearling fall Chinook salmon rearing and migratory habitat under two drawdown scenarios for John Day Reservoir, Columbia River Predicted changes in subyearling fall Chinook salmon rearing and migratory habitat under two drawdown scenarios for John Day Reservoir, Columbia River
We evaluated the potential effects of two different drawdown scenarios on rearing and migration habitat of subyearling fall Chinook salmon Oncorhynchus tshawytscha in John Day Reservoir on the Columbia River. We compared habitats at normal operating pool elevation with habitats at drawdown to spillway crest elevation and drawdown to the historical natural river elevation for two flows (4...
Authors
K.F. Tiffan, R.D. Garland, D.W. Rondorf
Food habits of Juvenile American Shad and dynamics of zooplankton in the lower Columbia River Food habits of Juvenile American Shad and dynamics of zooplankton in the lower Columbia River
As many as 2.4 million adult American shad annually pass John Day Dam, Columbia River to spawn upriver, yet food web interactions of juvenile shad rearing in John Day Reservoir are unexplored. We collected zooplankton and conducted mid-water trawls in McNary (June-July) and John Day reservoirs (August-November) from 1994 through 1996 during the outmigration of subyearling American shad...
Authors
C. A. Haskell, K.F. Tiffan, D.W. Rondorf
Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2004 Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2004
No abstract available
Authors
K.T. Tiffan, W.P. Connor
The effects of summer flow augmentation on the migratory behavior and survival of juvenile Snake River fall Chinook salmon. Annual report 2003 The effects of summer flow augmentation on the migratory behavior and survival of juvenile Snake River fall Chinook salmon. Annual report 2003
This report summarizes results of research activities conducted in 2002 and years previous to aid in the management and recovery of fall chinook salmon Oncorhynchus tshawytscha in the Columbia River basin. The report is divided into self-standing chapters. For detailed summaries, we refer the reader to the abstracts given on the second page of each chapter. The Annual Reporting section...
Authors
Kenneth F. Tiffan, Craig A. Haskell, William P. Connor
Measuring nighttime spawning behavior of chum salmon using a dual-frequency identification sonar (DIDSON) Measuring nighttime spawning behavior of chum salmon using a dual-frequency identification sonar (DIDSON)
The striking body coloration and morphology that Pacific salmon display during spawning coupled with elaborate courtship behaviors suggest that visual cues are important during their reproductive period. To date, virtually all existing information on chum salmon (Oncorhynchus keta) spawning behavior has been derived from studies conducted during the daytime, and has contributed to the...
Authors
K.F. Tiffan, D.W. Rondorf
Diel spawning behavior of chum salmon in the Columbia River Diel spawning behavior of chum salmon in the Columbia River
We conducted a study during 2003 in a side channel of the Columbia River downstream of Bonneville Dam to describe the diel spawning behavior of wild chum salmon Oncorhynchus keta. We collected observational data on 14 pairs of chum salmon using a dual-frequency identification sonar. Spawners of both genders were observed chasing intruders during nighttime and daytime as nests were...
Authors
K.F. Tiffan, D.W. Rondorf, J.J. Skalicky
Two alternative juvenile life history types for fall Chinook salmon in the Snake River basin Two alternative juvenile life history types for fall Chinook salmon in the Snake River basin
Fall Chinook salmon Oncorhynchus tshawytscha in the Snake River basin were listed under the Endangered Species Act in 1992. At the time of listing, it was assumed that fall Chinook salmon juveniles in the Snake River basin adhered strictly to an ocean-type life history characterized by saltwater entry at age 0 and first-year wintering in the ocean. Research showed, however, that some...
Authors
W.P. Connor, J.G. Sneva, K.F. Tiffan, R.K. Steinhorst, D. Ross
Biological science in Oregon Biological science in Oregon
Fishing is an important part of Oregon's culture. The Western Fisheries Research Center (WFRC) has been conducting research in Oregon for many years to provide information that can be used by managers to help keep fish and other parts of the ecosystem healthy. Below are examples of some of WFRC's studies.
Authors
Lyman Thorsteinson
Juvenile and adult fall Chinook and chum salmon habitat studies below Bonneville Dam on the Columbia River. Annual report 2002-2003 Juvenile and adult fall Chinook and chum salmon habitat studies below Bonneville Dam on the Columbia River. Annual report 2002-2003
We investigated spatial and temporal changes in subyearling fall Chinook salmon rearing habitat and areas dewatered below Bonneville Dam on the Columbia River. We used two-dimensional hydrodynamic modeling to predict water velocity and depth data. By combining two-dimensional hydrodynamic modeling with a predictive model of subyearling rearing presence, we were able to illustrate...
Authors
K.F. Tiffan, R. Garland, D. Rondorf, J. Skalicky
Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2003 Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2003
No abstract available
Authors
W.P. Connor, K.F. Tiffan, J.G. Sneva
Passage of juvenile fall Chinook salmon at Lower Granite Dam during winter. Annual report 2003 Passage of juvenile fall Chinook salmon at Lower Granite Dam during winter. Annual report 2003
No abstract available
Authors
C. A. Haskell, K.T. Tiffan, W.P. Connor, J.G. Sneva
Water temperature effects on fall Chinook salmon in the Snake and Columbia Rivers Water temperature effects on fall Chinook salmon in the Snake and Columbia Rivers
Abstract not available
Authors
C. A. Haskell, K.T. Tiffan, R.C. Koch, J.A. Heinz, M.G. Mesa, D.W. Rondorf
Science and Products
Filter Total Items: 114
Predicted changes in subyearling fall Chinook salmon rearing and migratory habitat under two drawdown scenarios for John Day Reservoir, Columbia River Predicted changes in subyearling fall Chinook salmon rearing and migratory habitat under two drawdown scenarios for John Day Reservoir, Columbia River
We evaluated the potential effects of two different drawdown scenarios on rearing and migration habitat of subyearling fall Chinook salmon Oncorhynchus tshawytscha in John Day Reservoir on the Columbia River. We compared habitats at normal operating pool elevation with habitats at drawdown to spillway crest elevation and drawdown to the historical natural river elevation for two flows (4...
Authors
K.F. Tiffan, R.D. Garland, D.W. Rondorf
Food habits of Juvenile American Shad and dynamics of zooplankton in the lower Columbia River Food habits of Juvenile American Shad and dynamics of zooplankton in the lower Columbia River
As many as 2.4 million adult American shad annually pass John Day Dam, Columbia River to spawn upriver, yet food web interactions of juvenile shad rearing in John Day Reservoir are unexplored. We collected zooplankton and conducted mid-water trawls in McNary (June-July) and John Day reservoirs (August-November) from 1994 through 1996 during the outmigration of subyearling American shad...
Authors
C. A. Haskell, K.F. Tiffan, D.W. Rondorf
Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2004 Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2004
No abstract available
Authors
K.T. Tiffan, W.P. Connor
The effects of summer flow augmentation on the migratory behavior and survival of juvenile Snake River fall Chinook salmon. Annual report 2003 The effects of summer flow augmentation on the migratory behavior and survival of juvenile Snake River fall Chinook salmon. Annual report 2003
This report summarizes results of research activities conducted in 2002 and years previous to aid in the management and recovery of fall chinook salmon Oncorhynchus tshawytscha in the Columbia River basin. The report is divided into self-standing chapters. For detailed summaries, we refer the reader to the abstracts given on the second page of each chapter. The Annual Reporting section...
Authors
Kenneth F. Tiffan, Craig A. Haskell, William P. Connor
Measuring nighttime spawning behavior of chum salmon using a dual-frequency identification sonar (DIDSON) Measuring nighttime spawning behavior of chum salmon using a dual-frequency identification sonar (DIDSON)
The striking body coloration and morphology that Pacific salmon display during spawning coupled with elaborate courtship behaviors suggest that visual cues are important during their reproductive period. To date, virtually all existing information on chum salmon (Oncorhynchus keta) spawning behavior has been derived from studies conducted during the daytime, and has contributed to the...
Authors
K.F. Tiffan, D.W. Rondorf
Diel spawning behavior of chum salmon in the Columbia River Diel spawning behavior of chum salmon in the Columbia River
We conducted a study during 2003 in a side channel of the Columbia River downstream of Bonneville Dam to describe the diel spawning behavior of wild chum salmon Oncorhynchus keta. We collected observational data on 14 pairs of chum salmon using a dual-frequency identification sonar. Spawners of both genders were observed chasing intruders during nighttime and daytime as nests were...
Authors
K.F. Tiffan, D.W. Rondorf, J.J. Skalicky
Two alternative juvenile life history types for fall Chinook salmon in the Snake River basin Two alternative juvenile life history types for fall Chinook salmon in the Snake River basin
Fall Chinook salmon Oncorhynchus tshawytscha in the Snake River basin were listed under the Endangered Species Act in 1992. At the time of listing, it was assumed that fall Chinook salmon juveniles in the Snake River basin adhered strictly to an ocean-type life history characterized by saltwater entry at age 0 and first-year wintering in the ocean. Research showed, however, that some...
Authors
W.P. Connor, J.G. Sneva, K.F. Tiffan, R.K. Steinhorst, D. Ross
Biological science in Oregon Biological science in Oregon
Fishing is an important part of Oregon's culture. The Western Fisheries Research Center (WFRC) has been conducting research in Oregon for many years to provide information that can be used by managers to help keep fish and other parts of the ecosystem healthy. Below are examples of some of WFRC's studies.
Authors
Lyman Thorsteinson
Juvenile and adult fall Chinook and chum salmon habitat studies below Bonneville Dam on the Columbia River. Annual report 2002-2003 Juvenile and adult fall Chinook and chum salmon habitat studies below Bonneville Dam on the Columbia River. Annual report 2002-2003
We investigated spatial and temporal changes in subyearling fall Chinook salmon rearing habitat and areas dewatered below Bonneville Dam on the Columbia River. We used two-dimensional hydrodynamic modeling to predict water velocity and depth data. By combining two-dimensional hydrodynamic modeling with a predictive model of subyearling rearing presence, we were able to illustrate...
Authors
K.F. Tiffan, R. Garland, D. Rondorf, J. Skalicky
Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2003 Investigating passage of ESA-listed juvenile fall Chinook salmon at Lower Granite Dam during winter when the fish bypass system is not operated. Annual report 2003
No abstract available
Authors
W.P. Connor, K.F. Tiffan, J.G. Sneva
Passage of juvenile fall Chinook salmon at Lower Granite Dam during winter. Annual report 2003 Passage of juvenile fall Chinook salmon at Lower Granite Dam during winter. Annual report 2003
No abstract available
Authors
C. A. Haskell, K.T. Tiffan, W.P. Connor, J.G. Sneva
Water temperature effects on fall Chinook salmon in the Snake and Columbia Rivers Water temperature effects on fall Chinook salmon in the Snake and Columbia Rivers
Abstract not available
Authors
C. A. Haskell, K.T. Tiffan, R.C. Koch, J.A. Heinz, M.G. Mesa, D.W. Rondorf