Christopher Guy, PhD
Assistant Unit Leader - Montana Cooperative Fishery Research Unit
Research Interests
- Fish ecology
- Fishery stock assessment
- Fishery management regulations and tools
- Native and non-native species interactions
Teaching Interests
- Fisheries Science
- Fisheries Techniques
Professional Experience
Assistant Unit Leader, Montana Cooperative Fishery Research Unit, 1994-
Education and Certifications
Ph D South Dakota State University 1993
Science and Products
Filter Total Items: 40
A comparison of two mobile electrode arrays for increasing mortality of Lake Trout embryos
Conservation of sport fisheries and populations of several native fishes in the western United States is dependent on sustained success of removal programs targeting invasive Lake Trout Salvelinus namaycush. Gill-netting of spawning adults is one strategy used to decrease spawning success; however, additional complementary methods are needed to disrupt Lake Trout reproduction where bycatch in gill
Authors
Peter J. Brown, Christopher S. Guy, Michael H. Meeuwig
Empirical estimation of recreational exploitation of burbot, Lota lota, in the Wind River drainage of Wyoming using a multistate capture–recapture model
Burbot, Lota lota (Linnaeus), is a regionally popular sportfish in the Wind River drainage of Wyoming, USA, at the southern boundary of the range of the species. Recent declines in burbot abundances were hypothesised to be caused by overexploitation, entrainment in irrigation canals and habitat loss. This study addressed the overexploitation hypothesis using tagging data to generate reliable explo
Authors
S. A. Lewandoski, Christopher S. Guy, Alexander V. Zale, Paul C. Gerrity, J. W. Deromedi, K. M. Johnson, D. L. Skates
Reproductive ecology, spawning behavior, and juvenile distribution of Mountain Whitefish in the Madison River, Montana
Mountain Whitefish Prosopium williamsoni were historically common throughout much of the U.S. Intermountain West. However, within the last decade Mountain Whitefish have exhibited population-level declines in some rivers. In the Madison River, Montana, anecdotal evidence indicates Mountain Whitefish abundance has declined and the population is skewed toward larger individuals, which is typically s
Authors
Jan K. Boyer, Christopher S. Guy, Molly A. H. Webb, Travis B. Horton, Thomas E. McMahon
Suppression of invasive lake trout in an isolated backcountry lake in Glacier National Park
Fisheries managers have implemented suppression programmes to control non-native lake trout, Salvelinus namaycush (Walbaum), in several lakes throughout the western United States. This study determined the feasibility of experimentally suppressing lake trout using gillnets in an isolated backcountry lake in Glacier National Park, Montana, USA, for the conservation of threatened bull trout, Salveli
Authors
C. R. Fredenberg, Clint C. Muhlfeld, Christopher S. Guy, Vincent S. D'Angelo, Christopher C. Downs, John M. Syslo
Gear comparison for sampling age-0 Mountain Whitefish in the Madison River, Montana
The efficacy of various sampling gears for age-0 Mountain Whitefish Prosopium williamsoni is largely unknown, which makes it difficult to investigate recruitment and early life history dynamics for the species. We compared four gears: seine, backpack electrofisher, minnow trap, and lighted minnow trap. Gears were tested in backwaters, large channels, and small channels in the Madison River, Montan
Authors
Jan K. Boyer, Christopher S. Guy, Molly A. H. Webb, Travis B. Horton, Thomas E. McMahon
A framework for assessing the feasibility of native fish conservation translocations: Applications to threatened bull trout
There is an urgent need to consider more aggressive and direct interventions for the conservation of freshwater fishes that are threatened by invasive species, habitat loss, and climate change. Conservation introduction (moving a species outside its indigenous range to other areas where conditions are predicted to be more suitable) is one type of translocation strategy that fisheries managers can
Authors
Benjamin T. Galloway, Clint C. Muhlfeld, Christopher S. Guy, Christopher C. Downs, Wade A. Fredenberg
Feeding ecology of native and nonnative salmonids during the expansion of a nonnative apex predator in Yellowstone Lake, Yellowstone National Park
The illegal introduction of Lake Trout Salvelinus namaycush into Yellowstone Lake, Yellowstone National Park, preceded the collapse of the native population of Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri, producing a four-level trophic cascade. The Yellowstone Cutthroat Trout population’s collapse and the coinciding increase in Lake Trout abundance provided a rare opportunity to eval
Authors
John M. Syslo, Christopher S. Guy, Todd M. Koel
Spawning and rearing behavior of bull trout in a headwater lake ecosystem
Numerous life histories have been documented for bull trout Salvelinus confluentus. Lacustrine-adfluvial bull trout populations that occupy small, headwater lake ecosystems and migrate short distances to natal tributaries to spawn are likely common; however, much of the research on potamodromous bull trout has focused on describing the spawning and rearing characteristics of bull trout populations
Authors
Lora B. Tennant, Robert E. Gresswell, Christopher S. Guy, Michael H. Meeuwig
Broadening the regulated-river management paradigm: A case study of the forgotten dead zone hindering Pallid Sturgeon recovery
The global proliferation of dams within the last half century has prompted ecologists to understand the effects of regulated rivers on large-river fishes. Currently, much of the effort to mitigate the influence of dams on large-river fishes has been focused on downriver effects, and little attention has been given to upriver effects. Through a combination of field observations and laboratory exper
Authors
Christopher S. Guy, Hilary B. Treanor, Kevin M. Kappenman, Eric A. Scholl, Jason E. Ilgen, Molly A. H. Webb
Spawning related movement of shovelnose sturgeon in the Missouri River above Fort Peck Reservoir, Montana
The hypotheses of this study were (i) that shovelnose sturgeon would make upstream movements to spawn, (ii) movement of spawning fish would be greater in a year with higher discharge, and (iii) that spawning fish would have greater movements than reproductively inactive fish. Shovelnose sturgeon Scaphirhynchus platorynchus (Rafinesque, 1820) in five reproductive categories (e.g. males, confirmed s
Authors
Ryan R. Richards, Christopher S. Guy, Molly A. Webb, William M. Gardner, C.B. Jensen
Baseline demographics of a nonnative lake trout population and inferences for suppression from sensitivity-elasticity analyses
No abstract available.
Authors
Christopher S. Guy, B.S. Cox, W.A. Fredenberg, L.R. Rosenthal
Comparison of harvest scenarios for the cost-effective suppression of Lake Trout in Swan Lake, Montana
Given the large amount of resources required for long-term control or eradication projects, it is important to assess strategies and associated costs and outcomes before a particular plan is implemented. We developed a population model to assess the cost-effectiveness of mechanical removal strategies for suppressing long-term abundance of nonnative Lake Trout Salvelinus namaycush in Swan Lake, Mon
Authors
John M. Syslo, Christopher S. Guy, Benjamin S. Cox
Science and Products
- Publications
Filter Total Items: 40
A comparison of two mobile electrode arrays for increasing mortality of Lake Trout embryos
Conservation of sport fisheries and populations of several native fishes in the western United States is dependent on sustained success of removal programs targeting invasive Lake Trout Salvelinus namaycush. Gill-netting of spawning adults is one strategy used to decrease spawning success; however, additional complementary methods are needed to disrupt Lake Trout reproduction where bycatch in gillAuthorsPeter J. Brown, Christopher S. Guy, Michael H. MeeuwigEmpirical estimation of recreational exploitation of burbot, Lota lota, in the Wind River drainage of Wyoming using a multistate capture–recapture model
Burbot, Lota lota (Linnaeus), is a regionally popular sportfish in the Wind River drainage of Wyoming, USA, at the southern boundary of the range of the species. Recent declines in burbot abundances were hypothesised to be caused by overexploitation, entrainment in irrigation canals and habitat loss. This study addressed the overexploitation hypothesis using tagging data to generate reliable exploAuthorsS. A. Lewandoski, Christopher S. Guy, Alexander V. Zale, Paul C. Gerrity, J. W. Deromedi, K. M. Johnson, D. L. SkatesReproductive ecology, spawning behavior, and juvenile distribution of Mountain Whitefish in the Madison River, Montana
Mountain Whitefish Prosopium williamsoni were historically common throughout much of the U.S. Intermountain West. However, within the last decade Mountain Whitefish have exhibited population-level declines in some rivers. In the Madison River, Montana, anecdotal evidence indicates Mountain Whitefish abundance has declined and the population is skewed toward larger individuals, which is typically sAuthorsJan K. Boyer, Christopher S. Guy, Molly A. H. Webb, Travis B. Horton, Thomas E. McMahonSuppression of invasive lake trout in an isolated backcountry lake in Glacier National Park
Fisheries managers have implemented suppression programmes to control non-native lake trout, Salvelinus namaycush (Walbaum), in several lakes throughout the western United States. This study determined the feasibility of experimentally suppressing lake trout using gillnets in an isolated backcountry lake in Glacier National Park, Montana, USA, for the conservation of threatened bull trout, SalveliAuthorsC. R. Fredenberg, Clint C. Muhlfeld, Christopher S. Guy, Vincent S. D'Angelo, Christopher C. Downs, John M. SysloGear comparison for sampling age-0 Mountain Whitefish in the Madison River, Montana
The efficacy of various sampling gears for age-0 Mountain Whitefish Prosopium williamsoni is largely unknown, which makes it difficult to investigate recruitment and early life history dynamics for the species. We compared four gears: seine, backpack electrofisher, minnow trap, and lighted minnow trap. Gears were tested in backwaters, large channels, and small channels in the Madison River, MontanAuthorsJan K. Boyer, Christopher S. Guy, Molly A. H. Webb, Travis B. Horton, Thomas E. McMahonA framework for assessing the feasibility of native fish conservation translocations: Applications to threatened bull trout
There is an urgent need to consider more aggressive and direct interventions for the conservation of freshwater fishes that are threatened by invasive species, habitat loss, and climate change. Conservation introduction (moving a species outside its indigenous range to other areas where conditions are predicted to be more suitable) is one type of translocation strategy that fisheries managers canAuthorsBenjamin T. Galloway, Clint C. Muhlfeld, Christopher S. Guy, Christopher C. Downs, Wade A. FredenbergFeeding ecology of native and nonnative salmonids during the expansion of a nonnative apex predator in Yellowstone Lake, Yellowstone National Park
The illegal introduction of Lake Trout Salvelinus namaycush into Yellowstone Lake, Yellowstone National Park, preceded the collapse of the native population of Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri, producing a four-level trophic cascade. The Yellowstone Cutthroat Trout population’s collapse and the coinciding increase in Lake Trout abundance provided a rare opportunity to evalAuthorsJohn M. Syslo, Christopher S. Guy, Todd M. KoelSpawning and rearing behavior of bull trout in a headwater lake ecosystem
Numerous life histories have been documented for bull trout Salvelinus confluentus. Lacustrine-adfluvial bull trout populations that occupy small, headwater lake ecosystems and migrate short distances to natal tributaries to spawn are likely common; however, much of the research on potamodromous bull trout has focused on describing the spawning and rearing characteristics of bull trout populationsAuthorsLora B. Tennant, Robert E. Gresswell, Christopher S. Guy, Michael H. MeeuwigBroadening the regulated-river management paradigm: A case study of the forgotten dead zone hindering Pallid Sturgeon recovery
The global proliferation of dams within the last half century has prompted ecologists to understand the effects of regulated rivers on large-river fishes. Currently, much of the effort to mitigate the influence of dams on large-river fishes has been focused on downriver effects, and little attention has been given to upriver effects. Through a combination of field observations and laboratory experAuthorsChristopher S. Guy, Hilary B. Treanor, Kevin M. Kappenman, Eric A. Scholl, Jason E. Ilgen, Molly A. H. WebbSpawning related movement of shovelnose sturgeon in the Missouri River above Fort Peck Reservoir, Montana
The hypotheses of this study were (i) that shovelnose sturgeon would make upstream movements to spawn, (ii) movement of spawning fish would be greater in a year with higher discharge, and (iii) that spawning fish would have greater movements than reproductively inactive fish. Shovelnose sturgeon Scaphirhynchus platorynchus (Rafinesque, 1820) in five reproductive categories (e.g. males, confirmed sAuthorsRyan R. Richards, Christopher S. Guy, Molly A. Webb, William M. Gardner, C.B. JensenBaseline demographics of a nonnative lake trout population and inferences for suppression from sensitivity-elasticity analyses
No abstract available.AuthorsChristopher S. Guy, B.S. Cox, W.A. Fredenberg, L.R. RosenthalComparison of harvest scenarios for the cost-effective suppression of Lake Trout in Swan Lake, Montana
Given the large amount of resources required for long-term control or eradication projects, it is important to assess strategies and associated costs and outcomes before a particular plan is implemented. We developed a population model to assess the cost-effectiveness of mechanical removal strategies for suppressing long-term abundance of nonnative Lake Trout Salvelinus namaycush in Swan Lake, MonAuthorsJohn M. Syslo, Christopher S. Guy, Benjamin S. Cox