{"id":66,"date":"2021-09-17T22:38:27","date_gmt":"2021-09-17T22:38:27","guid":{"rendered":"http:\/\/coloradoriverrecovery.org\/uc\/?page_id=66"},"modified":"2026-08-12T20:33:01","modified_gmt":"2026-08-12T20:33:01","slug":"research-monitoring","status":"publish","type":"page","link":"https:\/\/coloradoriverrecovery.org\/uc\/science\/technical-reports\/research-monitoring\/","title":{"rendered":"Research & Monitoring"},"content":{"rendered":"

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Technical Reports: Research & Monitoring<\/h1>\n

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Bonytail<\/h2>\n

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Bestgen, K.R., R.C. Schelly, R.R. Staffeldt, M.J. Breen, D.E. Snyder & M.T. Jones. 2017.\u00a0<\/span>First Reproduction by Stocked Bonytail in the Upper Colorado River Basin.\u00a0<\/span><\/strong>North American Journal of Fisheries Management, 37:2, 445-455, DOI: 10.1080\/02755947.2017.1280571.<\/a>
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Colorado pikeminnow<\/h2>\n

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Bestgen, K. R., D. Tuttle, G. C. White, C. T. Smith, M. T. Jones, K. Lawry, M. Partlow, S. Hyder, M. Breen, K. Creighton, S. Brockdorff, C. Noble, and T. Eyre. 2026. Population status and trends of Colorado pikeminnow in the Green River sub-Basin, Utah and Colorado, 2000\u20132024<\/strong>. Final Report. Colorado State University, Larval Fish Laboratory to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado. Larval Fish Laboratory Contribution 237.<\/a><\/p>\n

Elverud, D.S., D. B. Osmundson, and G. C. White.\u00a0 2025.\u00a0 Population structure and abundance of Colorado pikeminnow and abundance of Razorback Sucker of the upper Colorado River, 1991\u20132021<\/strong>.\u00a0 Project 127 Final Report. U. S. Fish and Wildlife Service, Grand Junction, Colorado.<\/a><\/p>\n

Elverud, D.S., D. B. Osmundson, and G. C. White. 2020.\u00a0<\/span>Population structure, abundance and recruitment of Colorado pikeminnow of the upper Colorado River, 1991\u20132015.\u00a0<\/span><\/strong>Final Report. U. S. Fish and Wildlife Service, Grand Junction, Colorado.<\/a><\/p>\n

Miller, Phillip S. 2018.\u00a0<\/span>Population Viability Analysis for the Colorado Pikeminnow (Ptychocheilus lucius) An Assessment of Current Threats to Species Recovery and Evaluation of Management Alternatives.\u00a0<\/span><\/strong>Final Report of the IUCN SSC Conservation Planning Specialist Group to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

SUPPLEMENTAL INFORMATION<\/strong><\/a><\/p>\n

Bestgen, K.R., C.D. Walford, G.C. White, J.A. Hawkins, M.T. Jones, P.A. Webber, M. Breen, J.A. Skorupski Jr., J. Howard, K. Creighton, J. Logan, K. Battige, and F.B. Wright. 2018.\u00a0<\/span>Population Status and Trends of Colorado pikeminnow in the Green River Sub-Basin, Utah and Colorado, 2000-2013.\u00a0<\/span><\/strong>Final Report of the Larval Fish Laboratory, Colorado State University to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Osmundson, D.B., and G.C. White. 2014.\u00a0<\/span>Population Structure, Abundance and Recruitment of Colorado Pikeminnow of the Upper Colorado River, 1991-2010.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Breen, M.J., M. Swasey, P. Badame, K. Creighton. 2011.\u00a0<\/span>Upper Colorado River basin young-of-year Colorado pikeminnow\u00a0<\/span>(Ptychocheilus lucius)<\/i>\u00a0<\/span>monitoring: Summary report 1986-2009.\u00a0<\/span><\/strong>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Bestgen, K.R., J.A. Hawkins, G.C. White, C.D. Walford, P. Badame, and L. Monroe. 2010.\u00a0<\/span>Population status of Colorado pikeminnow in the Green River Basin, Utah and Colorado, 2006-2008.\u00a0<\/span><\/strong>Final Report of the Larval Fish Laboratory, Colorado State University to the Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Osmundson, D.B., and G.C. White. 2009.\u00a0<\/span>Population status and trends of Colorado pikeminnow of the upper Colorado River, 1991-2005.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Kitcheyan, D.C., and M. Montagne. 2005.\u00a0<\/span>Movement, Migration, and Habitat Use by Colorado Pikeminnow,\u00a0<\/span>(Ptychocheilus lucius)<\/i>\u00a0<\/span>in a Regulated River Below Flaming Gorge Dam, Utah.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Upper Colorado River Endangered Fish Recovery Program. 2006.\u00a0<\/span>Evaluation of Population Estimates for Colorado Pikeminnow and Humpback Chub in the Upper Colorado River Basin.\u00a0<\/span><\/strong>Final Report of Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Bestgen, K.R., J. A. Hawkins, G. C. White, K. Chrisopherson, M. Hudson, M. H. Fuller, D. C. Kitcheyan, R. Brunson, P. Badame, G. B. Haines, J. Jackson, C. D. Walford, T. A. Sorensen, and T. B. Williams. 2005.\u00a0<\/span>Population Status of Colorado Pikeminnow in the Green River Basin, Utah and Colorado.\u00a0<\/span><\/strong>Final Report of Colorado State University Larval Fish Laboratory to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Osmundson, D.B. 2002.\u00a0<\/span>Population dynamics of Colorado pikeminnow in the upper Colorado River.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

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Humpback chub<\/h2>\n

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Ahrens, Z. T., T. A. Francis, B. A. Hines, K. R. Bestgen, and G. C. White. 2026. Population abundance and demographic estimates for humpback chub in Black Rocks, Colorado and Westwater Canyon, Utah, 2020\u20132021<\/strong>, UCRP Projects 131 and 132. Final Report. Utah Division of Wildlife Resources, Moab Field Station to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Francis, T.A., K.R. Bestgen, and G.C. White.\u00a0 2022.\u00a0 Population status of humpback chub, Gila cypha, and catch indices and population structure of sympatric roundtail chub, Gila robusta, in Black Rocks, Colorado River, Colorado, 1998-2017<\/strong>.\u00a0 Larval Fish Laboratory Contribution 222.\u00a0 Final Report from the U.S. Fish and Wildlife Service to the Upper Colorado River Endangered Fish Recovery Program, Project Number 131.\u00a0 Grand Junction, Colorado.<\/a><\/p>\n

Caldwell, J. 2021. Humpback Chub Gila cypha Monitoring in Desolation and Gray Canyons of the Green River, Utah, 2018-2019.<\/strong> Project 129 U.S. Bureau of Reclamation. Utah Division of Wildlife 1165 S. Hwy 191 Suite 4 Moab, UT<\/a><\/p>\n

Hines, B. A., K. R. Bestgen, and G. C. White. 2020.Abundance estimates for humpback chub (Gila cypha) and roundtail chub (Gila robusta) in Westwater Canyon, Colorado River, Utah 2016\u20132017.<\/strong>Final Report, Project 132. Upper Colorado River Endangered Fish Recovery Program, Lakewood, Colorado. Larval Fish Laboratory Contribution 219, Colorado State University, Fort Collins, CO.<\/a><\/p>\n

Howard, J. and J. Caldwell. 2018.\u00a0<\/span>Population Estimates for Humpback Chub (Gila cypha) in Desolation and Gray Canyons, Green River, Utah 2001-2015.<\/strong>\u00a0<\/span>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Francis, T.A., K.R. Bestgen and G.C. White. 2016.Population Status of Humpback Chub, Gila cypha, and Catch Indices and Population Structure of Sympatric Roundtail Chub, Gila Robusta, in Black Rocks, Colorado River, Colorado, 1998-2012.<\/strong>Larval Fish Laboratory Contribution 199. Final Report to the Upper Colorado River Endangered Fish Recovery Program Project Number 131. Grand Junction, Colorado.<\/a><\/p>\n

Hines, B.A., K.R. Bestgen and G.C. White. 2016.\u00a0<\/span>Abundance Estimates for Humpback Chub (Gila cypha) and Roundtail Chub (Gila robusta) in Westwater Canyon, Colorado River, Utah 2011-2012.\u00a0<\/span><\/strong>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Elverud, D. 2012.Population Estimates for Humpback Chub (Gila cypha) and Roundtail Chub (Gila robusta) in Westwater Canyon, Colorado River, Utah 2007\u20132008.<\/strong>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Badame, P. 2012.\u00a0<\/span>Population estimates for humpback chub (Gila cypha) in Desolation and Gray Canyons, Green River, Utah 2006-2007.<\/strong>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Francis, T.A., and C.W. McAda. 2011.Population size and structure of humpback chub, Gila cypha and roundtail chub, G. robusta, in Black Rocks, Colorado River, Colorado, 2007\u20132008.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Jackson, J. A. 2010.\u00a0<\/span>Population Estimate for Humpback Chub\u00a0<\/span>(Gila cypha)<\/i>\u00a0<\/span>and Roundtail Chub\u00a0<\/span>(Gila robusta)<\/i>\u00a0<\/span>in Westwater Canyon, Colorado River, Utah 2003-2005.<\/strong>\u00a0<\/span>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Hudson, J.M., and J.A. Jackson. 2003.\u00a0<\/span>Population Estimates for Humpback Chub\u00a0<\/span>(Gila cypha)<\/i>\u00a0<\/span>and Roundtail Chub\u00a0<\/span>(Gila robusta)<\/i>\u00a0<\/span>in Westwater Canyon, Colorado River, Utah, 1998-2000.\u00a0<\/span><\/strong>Final Report of Utah Division of Wildlife Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

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Razorback sucker<\/h2>\n

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Zelasko, K.A., K.R. Bestgen, and G.C. White. 2020.\u00a0<\/span>Estimation challenges with large-river fish: Razorback Sucker abundance and vital rates in the Green River, Utah.\u00a0<\/span><\/strong>Final Report of Larval Fish Laboratory, Colorado State University to Upper Colorado Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Zelasko, K.A., K.R. Bestgen, and G.C. White. 2018.\u00a0<\/span>Abundance and survival rates of razorback suckers Xyrauchen texanus in the Green River, Utah, 2011-2013.\u00a0<\/span><\/strong>Final Report of Larval Fish Laboratory, Colorado State University to Upper Colorado Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Bestgen, K.R., K.A. Zelasko, and G.C. White. 2012.\u00a0<\/span>Monitoring Reproduction, Recruitment, and population status of razorback suckers in the Upper Colorado River Basin.\u00a0<\/span><\/strong>Final Report of Larval Fish Laboratory, Colorado State University to Upper Colorado Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Osmundson, D.B., and S.C. Seal. 2009.\u00a0<\/span>Successful Spawning by Stocked Razorback Sucker in the Gunnison and Colorado Rivers, as Evidenced by Larval Fish Collections, 2002-2007.\u00a0<\/span><\/strong>Final Report of U.S. Fish and Wildlife Service to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Bestgen, K. R., G. B. Haines, R. Brunson, T. Chart, M. Trammell, R. T. Muth, G. Birchell, K. Christopherson, and J. M. Bundy. 2002.\u00a0<\/span>Status of wild razorback sucker in the Green River Basin, Utah and Colorado, determined from basinwide monitoring and other sampling programs.\u00a0<\/span><\/strong>Final Report, Colorado River Recovery Implementation Program Project Number 22D, Denver, Colorado.<\/a><\/p>\n

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Other<\/h2>\n

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Bestgen, K.R., K. A. Zelasko, E. R. Kluender, C. T. Smith, and M. T. Jones. 2026. Invasive predators overwhelm natural and re-regulated flow and temperature benefits and decimate native fish<\/strong>. Final report to the Upper Colorado River Endangered Fish Recovery Program. Denver, Colorado. Department of Fish, Wildlife, and Conservation Biology, Colorado State University, Fort Collins. Larval Fish Laboratory Contribution 234.<\/a><\/p>\n

Elverud, D. 2022. Monitoring Large-Bodied, Young-of-Year, and Larval Fishes of the Upper Colorado River and the Lower Gunnison River, Colorado in Response to Reoperation of the Aspinall Unit Reservoirs 2011-2016.<\/strong> Grand Junction Fish and Wildlife Conservation Office. Grand Junction, Colorado.<\/a><\/p>\n

<\/a>Martinez, P.J., A. L. Kolz. 2018.\u00a0<\/span>Recommended Electrofishing Guidelines for Upper Colorado River Basin Habitats Containing Endangered Fishes .\u00a0<\/span><\/strong>Standard Operating Procedure for Electrofishing to the Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a>
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Snyder, D.E., S.C. Seal, J.A. Charles, and C.L. Bjork. 2016.\u00a0<\/span>Guide to Cyprinid Fish Larvae and Early Juveniles of the Upper Colorado River Basin with Computer-Interactive Key.\u00a0<\/span><\/strong>Final Report of the Larval Fish Laboratory, Colorado State University to the Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Hawkins, J. 2008.\u00a0<\/span>Fish handling guidance for the Upper Colorado Endangered Fish Recovery Program. <\/span><\/strong>Report of Larval Fish Laboratory, Colorado State University to Upper Colorado Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Valdez, R.A., A. Widmer, K. Bestgen. 2011. Research Framework for the Upper Colorado River Basin.<\/strong> Final Report of SWCA Environmental Consultants and Larval Fish Laboratory, Colorado State University Resources to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

Tyus, H.M., and J.F. Saunders, III. 2001.\u00a0<\/span>An Evaluation of the Role of Tributary Streams for Recovery of Endangered Fishes in the Upper Colorado River Basin, with Recommendations for Future Recovery Actions.\u00a0<\/span><\/strong>Final Report of University of Colorado at Boulder Center for Limnology to Upper Colorado River Endangered Fish Recovery Program, Denver, Colorado.<\/a><\/p>\n

McAda, C. 1987. Interagency Standardized Monitoring Program (ISMP).\u00a0<\/span><\/strong>Final Interagency Standardized Monitoring Program Handbook. U.S. Fish and Wildlife Service, Colorado River Fisheries Project, Grand Junction, Colorado.<\/a><\/p>\n

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Technical Reports: Research & Monitoring Bonytail Bestgen, K.R., R.C. Schelly, R.R. Staffeldt, M.J. Breen, D.E. Snyder & M.T. Jones. 2017.\u00a0First Reproduction by Stocked Bonytail in the Upper Colorado River Basin.\u00a0North American Journal of Fisheries Management, 37:2, 445-455, DOI: 10.1080\/02755947.2017.1280571. Colorado pikeminnow Bestgen, K. R., D. Tuttle, G. C. White, C. T. Smith, M. T. Jones, […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":52,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-66","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/pages\/66","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/comments?post=66"}],"version-history":[{"count":47,"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/pages\/66\/revisions"}],"predecessor-version":[{"id":6520,"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/pages\/66\/revisions\/6520"}],"up":[{"embeddable":true,"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/pages\/52"}],"wp:attachment":[{"href":"https:\/\/coloradoriverrecovery.org\/uc\/wp-json\/wp\/v2\/media?parent=66"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}