Brian Ekstrom
Brian is a Fish Biologist working at the USGS, Columbia River Research Laboratory.
Science and Products
Filter Total Items: 20
Behavior and movement of adult summer steelhead following collection and release, lower Cowlitz River, Washington, 2012--2013 Behavior and movement of adult summer steelhead following collection and release, lower Cowlitz River, Washington, 2012--2013
Executive Summary Historically, adult summer steelhead Oncorhynchus mykiss returning to hatcheries on the lower Cowlitz River were sometimes transported and released in the river (recycled) to provide additional angling opportunity for the popular sport fishery in the basin. However, this practice has not been used in recent years because of concerns associated with interactions between...
Authors
Tobias Kock, Theresa Liedtke, Brian Ekstrom, Dennis Rondorf, Chris Gleizes, Wolf Dammers, Scott Gibson, Jamie Murphy
Behavior and passage of juvenile salmonids during the evaluation of a behavioral guidance structure at Cowlitz Falls Dam, Washington, 2011 Behavior and passage of juvenile salmonids during the evaluation of a behavioral guidance structure at Cowlitz Falls Dam, Washington, 2011
Executive Summary A radiotelemetry evaluation was conducted during April–October 2011 to describe movement patterns, forebay behavior, and passage of juvenile steelhead, coho salmon, and Chinook salmon at Cowlitz Falls Dam, Washington. The primary focus of the study was to describe fish behavior near a behavioral guidance structure (BGS) and floating surface collector (FSC) deployed...
Authors
Tobias Kock, Theresa Liedtke, Brian Ekstrom, Ryan Tomka, Dennis Rondorf
Evaluation of angler effort and harvest of rainbow trout (Oncorhynchus mykiss), Lake Scanewa, Washington, 2010 Evaluation of angler effort and harvest of rainbow trout (Oncorhynchus mykiss), Lake Scanewa, Washington, 2010
A creel evaluation was conducted in Lake Scanewa, a reservoir on the Cowlitz River, to monitor catch rates of rainbow trout (Oncorhynchus mykiss) and determine if the trout fishery was having negative impacts on juvenile anadromous salmon (Oncorhynchus spp.) in the system. The trout fishery, which is supported by releases of 20,000 fish (2 fish per pound) per year from June to August...
Authors
Theresa Liedtke, Tobias Kock, Brian Ekstrom, Ryan Tomka, Dennis Rondorf
Behavior and movement of formerly landlocked juvenile coho salmon after release into the free-flowing Cowlitz River, Washington Behavior and movement of formerly landlocked juvenile coho salmon after release into the free-flowing Cowlitz River, Washington
Formerly landlocked Coho Salmon (Oncorhynchus kisutch) juveniles (age 2) were monitored following release into the free-flowing Cowlitz River to determine if they remained in the river or resumed seaward migration. Juvenile Coho Salmon were tagged with a radio transmitter (30 fish) or Floy tag (1050 fish) and their behavior was monitored in the lower Cowlitz River. We found that 97% of...
Authors
Tobias Kock, Julie Henning, Theresa Liedtke, Ida Royer, Brian Ekstrom, Dennis Rondorf
Juvenile salmonid collection efforts in the Upper Cowlitz River Basin Juvenile salmonid collection efforts in the Upper Cowlitz River Basin
n/a
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, I.M. Royer, D.W. Rondorf
Behavior and passage of juvenile salmonids during the evaluation of a fish screen at Cowlitz Falls Dam, Washington, 2008 Behavior and passage of juvenile salmonids during the evaluation of a fish screen at Cowlitz Falls Dam, Washington, 2008
No abstract available
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, D.W. Rondorf
Behavior and movement of adult chum salmon in the lower Cowlitz River, 2007: Final Report of Research Behavior and movement of adult chum salmon in the lower Cowlitz River, 2007: Final Report of Research
n/a
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, D.W. Rondorf, J. Henning
Behavior and passage of juvenile salmonids during evaluation of a fish screen at Cowlitz Falls, Dam, 2007: Final Report of Research Behavior and passage of juvenile salmonids during evaluation of a fish screen at Cowlitz Falls, Dam, 2007: Final Report of Research
n/a
Authors
T.L. Liedtke, T.J. Kock, M.A Kritter, B.K. Ekstrom, D.W. Rondorf
Science and Products
Filter Total Items: 20
Behavior and movement of adult summer steelhead following collection and release, lower Cowlitz River, Washington, 2012--2013 Behavior and movement of adult summer steelhead following collection and release, lower Cowlitz River, Washington, 2012--2013
Executive Summary Historically, adult summer steelhead Oncorhynchus mykiss returning to hatcheries on the lower Cowlitz River were sometimes transported and released in the river (recycled) to provide additional angling opportunity for the popular sport fishery in the basin. However, this practice has not been used in recent years because of concerns associated with interactions between...
Authors
Tobias Kock, Theresa Liedtke, Brian Ekstrom, Dennis Rondorf, Chris Gleizes, Wolf Dammers, Scott Gibson, Jamie Murphy
Behavior and passage of juvenile salmonids during the evaluation of a behavioral guidance structure at Cowlitz Falls Dam, Washington, 2011 Behavior and passage of juvenile salmonids during the evaluation of a behavioral guidance structure at Cowlitz Falls Dam, Washington, 2011
Executive Summary A radiotelemetry evaluation was conducted during April–October 2011 to describe movement patterns, forebay behavior, and passage of juvenile steelhead, coho salmon, and Chinook salmon at Cowlitz Falls Dam, Washington. The primary focus of the study was to describe fish behavior near a behavioral guidance structure (BGS) and floating surface collector (FSC) deployed...
Authors
Tobias Kock, Theresa Liedtke, Brian Ekstrom, Ryan Tomka, Dennis Rondorf
Evaluation of angler effort and harvest of rainbow trout (Oncorhynchus mykiss), Lake Scanewa, Washington, 2010 Evaluation of angler effort and harvest of rainbow trout (Oncorhynchus mykiss), Lake Scanewa, Washington, 2010
A creel evaluation was conducted in Lake Scanewa, a reservoir on the Cowlitz River, to monitor catch rates of rainbow trout (Oncorhynchus mykiss) and determine if the trout fishery was having negative impacts on juvenile anadromous salmon (Oncorhynchus spp.) in the system. The trout fishery, which is supported by releases of 20,000 fish (2 fish per pound) per year from June to August...
Authors
Theresa Liedtke, Tobias Kock, Brian Ekstrom, Ryan Tomka, Dennis Rondorf
Behavior and movement of formerly landlocked juvenile coho salmon after release into the free-flowing Cowlitz River, Washington Behavior and movement of formerly landlocked juvenile coho salmon after release into the free-flowing Cowlitz River, Washington
Formerly landlocked Coho Salmon (Oncorhynchus kisutch) juveniles (age 2) were monitored following release into the free-flowing Cowlitz River to determine if they remained in the river or resumed seaward migration. Juvenile Coho Salmon were tagged with a radio transmitter (30 fish) or Floy tag (1050 fish) and their behavior was monitored in the lower Cowlitz River. We found that 97% of...
Authors
Tobias Kock, Julie Henning, Theresa Liedtke, Ida Royer, Brian Ekstrom, Dennis Rondorf
Juvenile salmonid collection efforts in the Upper Cowlitz River Basin Juvenile salmonid collection efforts in the Upper Cowlitz River Basin
n/a
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, I.M. Royer, D.W. Rondorf
Behavior and passage of juvenile salmonids during the evaluation of a fish screen at Cowlitz Falls Dam, Washington, 2008 Behavior and passage of juvenile salmonids during the evaluation of a fish screen at Cowlitz Falls Dam, Washington, 2008
No abstract available
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, D.W. Rondorf
Behavior and movement of adult chum salmon in the lower Cowlitz River, 2007: Final Report of Research Behavior and movement of adult chum salmon in the lower Cowlitz River, 2007: Final Report of Research
n/a
Authors
T.L. Liedtke, T.J. Kock, B.K. Ekstrom, D.W. Rondorf, J. Henning
Behavior and passage of juvenile salmonids during evaluation of a fish screen at Cowlitz Falls, Dam, 2007: Final Report of Research Behavior and passage of juvenile salmonids during evaluation of a fish screen at Cowlitz Falls, Dam, 2007: Final Report of Research
n/a
Authors
T.L. Liedtke, T.J. Kock, M.A Kritter, B.K. Ekstrom, D.W. Rondorf