Timothy Counihan (Former Employee)
Science and Products
Filter Total Items: 56
A simulation study of factors controlling white sturgeon recruitment in the Snake River
Five of the nine populations of white sturgeon Acipenser transmontanus, located between dams on the Middle Snake River, have declined from historical levels and are now at risk of extinction. One step towards more effectively protecting and managing these nine populations is ranking factors that influence recruitment in each of these river segments. We developed a model to suggest which of seven m
Authors
H.I. Jager, W. Van Winkle, James Angus Chandler, K.B. Lepla, P. Bates, T.D. Counihan
Estimating the survival of juvenile salmonids passing through The Dalles Dam using radio-telemetry, 2002
Abstract not available
Authors
T.D. Counihan, K. Felton, G.S. Holmberg, J.H. Petersen
Using radiotelemetry to determine fish passage information at large hydroelectric dams: Design and analysis to achieve multiple objectives with a single design
Abstract not available
Authors
J.W. Beeman, T.D. Counihan
Length changes in white sturgeon larvae preserved in ethanol or formaldehyde
We examined the effects of two preservatives on the notochord and total lengths of white sturgeon (Acipenser transmontanus) larvae. White sturgeon larvae that were one, seven, and 14 days old were measured live and then preserved in 95% ethanol or 10% formaldehyde. Length changes were then determined at 20 and 95 days after preservation. We found mean length changes ranging from 0.4% to 3.4% shrin
Authors
J.M. Bayer, T.D. Counihan
Survival estimates of migrant juvenile salmonids in the Columbia River from John Day Dam through Bonneville Dam using radio-telemetry. Annual report 2000
Abstract not available
Authors
T.D. Counihan, J.H. Petersen
Estimating the survival of juvenile salmonids passing through The Dalles Dam using radio-telemetry, 2001
Abstract not available
Authors
T.D. Counihan, K. Felton, G.S. Holmberg
The effects of dissolved gas supersaturation on white sturgeon larvae
Spill at dams has caused supersaturation of atmospheric gas in waters of the Columbia and Snake rivers and raised concerns about the effects of dissolved gas supersaturation (DGS) on white sturgeons Acipenser transmontanus. The timing and location of white sturgeon spawning and the dispersal of white sturgeon larvae from incubation areas makes the larval stage potentially vulnerable to the effects
Authors
T.D. Counihan, Allen I. Miller, M.G. Mesa, M.J. Parsley
Movement, distribution, and behavior of radio-tagged sub-yearling Chinook salmon in the forebay of John Day Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, B.D. Liedtke, M.S. Novick, J.M. Plumb
Estimates of fish and spill passage efficiency of radio-tagged juvenile steelhead and yearling Chinook salmon at John Day Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, B.D. Liedtke, M.S. Novick, J.M. Plumb
Estimates of fish-, spill-, and sluiceway-passage efficiencies of radio-tagged juvenile steelhead and yearling Chinook salmon at The Dalles Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, J.M. Hardiman, B.D. Liedtke, M.S. Novick, J.M. Plumb
Influence of externally attached trasmitters on the swimming performance of juvenile white sturgeon
We measured the critical swimming speed of juvenile white sturgeons Acipenser transmontanus equipped with externally attached dummy ultrasonic transmitters and of untagged control fish in the laboratory. White sturgeons ranging from 31.9 to 37.0 cm fork length were subjected to one of three treatments: Control (handled but not tagged), tag attached below the dorsal fin, and tag attached with the a
Authors
T.D. Counihan, C.N. Frost
Feasibility of extracting survival information from radio-telemetry studies at the John Day Dam
Abstract not available
Authors
T.D. Counihan, J.H. Petersen, N.S. Adams, R.S. Shively, H.C. Hansel
Science and Products
Filter Total Items: 56
A simulation study of factors controlling white sturgeon recruitment in the Snake River
Five of the nine populations of white sturgeon Acipenser transmontanus, located between dams on the Middle Snake River, have declined from historical levels and are now at risk of extinction. One step towards more effectively protecting and managing these nine populations is ranking factors that influence recruitment in each of these river segments. We developed a model to suggest which of seven m
Authors
H.I. Jager, W. Van Winkle, James Angus Chandler, K.B. Lepla, P. Bates, T.D. Counihan
Estimating the survival of juvenile salmonids passing through The Dalles Dam using radio-telemetry, 2002
Abstract not available
Authors
T.D. Counihan, K. Felton, G.S. Holmberg, J.H. Petersen
Using radiotelemetry to determine fish passage information at large hydroelectric dams: Design and analysis to achieve multiple objectives with a single design
Abstract not available
Authors
J.W. Beeman, T.D. Counihan
Length changes in white sturgeon larvae preserved in ethanol or formaldehyde
We examined the effects of two preservatives on the notochord and total lengths of white sturgeon (Acipenser transmontanus) larvae. White sturgeon larvae that were one, seven, and 14 days old were measured live and then preserved in 95% ethanol or 10% formaldehyde. Length changes were then determined at 20 and 95 days after preservation. We found mean length changes ranging from 0.4% to 3.4% shrin
Authors
J.M. Bayer, T.D. Counihan
Survival estimates of migrant juvenile salmonids in the Columbia River from John Day Dam through Bonneville Dam using radio-telemetry. Annual report 2000
Abstract not available
Authors
T.D. Counihan, J.H. Petersen
Estimating the survival of juvenile salmonids passing through The Dalles Dam using radio-telemetry, 2001
Abstract not available
Authors
T.D. Counihan, K. Felton, G.S. Holmberg
The effects of dissolved gas supersaturation on white sturgeon larvae
Spill at dams has caused supersaturation of atmospheric gas in waters of the Columbia and Snake rivers and raised concerns about the effects of dissolved gas supersaturation (DGS) on white sturgeons Acipenser transmontanus. The timing and location of white sturgeon spawning and the dispersal of white sturgeon larvae from incubation areas makes the larval stage potentially vulnerable to the effects
Authors
T.D. Counihan, Allen I. Miller, M.G. Mesa, M.J. Parsley
Movement, distribution, and behavior of radio-tagged sub-yearling Chinook salmon in the forebay of John Day Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, B.D. Liedtke, M.S. Novick, J.M. Plumb
Estimates of fish and spill passage efficiency of radio-tagged juvenile steelhead and yearling Chinook salmon at John Day Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, B.D. Liedtke, M.S. Novick, J.M. Plumb
Estimates of fish-, spill-, and sluiceway-passage efficiencies of radio-tagged juvenile steelhead and yearling Chinook salmon at The Dalles Dam, 1999
Abstract not available
Authors
H.C. Hansel, J.W. Beeman, T.D. Counihan, J.M. Hardiman, B.D. Liedtke, M.S. Novick, J.M. Plumb
Influence of externally attached trasmitters on the swimming performance of juvenile white sturgeon
We measured the critical swimming speed of juvenile white sturgeons Acipenser transmontanus equipped with externally attached dummy ultrasonic transmitters and of untagged control fish in the laboratory. White sturgeons ranging from 31.9 to 37.0 cm fork length were subjected to one of three treatments: Control (handled but not tagged), tag attached below the dorsal fin, and tag attached with the a
Authors
T.D. Counihan, C.N. Frost
Feasibility of extracting survival information from radio-telemetry studies at the John Day Dam
Abstract not available
Authors
T.D. Counihan, J.H. Petersen, N.S. Adams, R.S. Shively, H.C. Hansel