Sign In
Dr. George J. Schisler
Dr. George J. Schisler

​​​​​​​​​​​​​​​Aquatic Research Section Leader

Contact Information

Colorado Parks and Wildlife

317 West Prospect Street

Fort Collins, CO 80526

Phone: (970) 472-4361

Fax: (970) 472-4457


Google Scholar Profile​

ResearchGate Profile​


  • Ph.D., Fishery and Wildlife Biology — Colorado State University, 1999

  • M.S., Fishery and Wildlife Biology — Colorado State University, 1995

  • B.S., Biology and Fishery Science — University of Alaska, 1992

Current or Recent Positions

  • Aquatic Research Chief — Colorado Parks and Wildlife, 2011-Present

  • Aquatic Research Scientist — Colorado Parks and Wildlife, 2001-2011

  • Post-Doctorate Fellow — Colorado State University, 1999-2000

  • Research Associate — Colorado Cooperative Fish and Wildlife Research Unit, 1993-1999

Current or Recent Research Projects

Directs statewide aquatic research activities involving all aspects of native and non-native aquatic wildlife. Supervises a staff of 14 research scientists, hatchery technicians, and support staff. Ongoing research studies include evaluations of various strains of whirling disease resistant rainbow trout for hatchery production re-establishment in the wild.   

Areas of Interest/Expertise

My research interest areas include salmonid reproduction and strain selection, salmonid disease studies, the economic impacts of fisheries in Colorado, and angler creel and mail-in surveys. 


R. B. Nehring, G. J. Schisler, L. Chiaramonte, A. Horton and B. Poole. 2016. Accelerated deactivation of Myxobolus cerebralis myxospores by susceptible and non-susceptible Tubifex tubifex. Diseases of Aquatic Organisms 121(1):37-47.

​Purdy, P., E.A. Barbosa, C. J. Praamsma, and G. J. Schisler. 2016. Modification of trout sperm membranes associated with activation and cryopreservation. Implications for fertilizing potential. Cryobiology 2016,

Nehring, R. B., G. Schisler, L. Chiaramonte, A. Horton, and B. Poole. 2015. Assessment of the long-term viability of the myxospores of Myxobolus cerebralis as determined by production of the actinospores by Tubifex tubifex. Journal of Aquatic Animal Health. 27(1):50-56.

​Fetherman, E. R., D. L. Winkelman, L. L. Bailey, G. J. Schisler, and K. Davies. 2015. Brown trout removal effects on short-term survival and movement of Myxobolus cerebralis-resistant rainbow trout. Transactions of the American Fisheries Society 144:610-626.​

Fetherman, E. R., D. L. Winkelman, M. R. Baerwald, and G. J. Schisler. 2014. Survival and reproduction of Myxobolus cerebralis resistant rainbow trout in the Colorado River and increased survival of age-0 progeny. PLoS ONE9(5):e96954.

​Fetherman, E.R., D. L. Winkelman, G. J. Schisler, and M. F. Antolin. 2012. Genetic basis of differences in myxospore count between whirling disease-resistant and –susceptible strains of rainbow trout. Diseases of Aquatic Organisms. 102: 97-106.

Baerwald, M. R., Petersen, J. L., Hedrick, R. P., Schisler, G. J., and B. May. 2011. A major effect quantitative trait locus for whirling disease resistance identified in rainbow trout Oncorhynchus mykiss. Heredity (2011) 106:920-926.

Fetherman, E. R., D. L. Winkelman, G. J. Schisler, and C. A. Myrick. 2011. The effects of Myxobolus cerebralis on the physiological performance of whirling disease resistant and susceptible strains of rainbow trout. Journal of Aquatic Animal Health 23:169-177.

Schisler, G. J., N. K. M. Vieira, and P. G. Walker. 2008. Application of Household Disinfectants to Control New Zealand Mudsnails.​ North American Journal of Fisheries Management 28:1172–1176.

Schisler, G. J., K. A. Myklebust, and R. P. Hedrick. 2006. Inheritance of Myxobolus cerebralis resistance among F1-generation crosses of whirling disease resistant and susceptible rainbow trout strains. Journal of Aquatic Animal Health 18:109– 115.

Schisler, G. J., and E. P. Bergersen. 2002. Evaluation of risk of high elevation Colorado waters to the establishment of Myxobolus cerebralis​. Pages 33-41 in J. L. Bartholomew and J. C. Wilson, editors. Whirling disease: reviews and current topics. American Fisheries Society, Symposium 29, Bethesda, Maryland.

Schisler, G. J., E. P. Bergersen, P. G. Walker, J. Wood, and J. K. Epp. 2001. C​omparison of single-round polymerase chain reaction (PCR) and pepsin-trypsin digest (PTD) methods for detection of Myxobolus cerebralis. Diseases of Aquatic Organisms 45:109-114.

Schisler, G. J. and E. P. Bergersen. 2000. Effects of multiple stressors on morbidity and mortality of fingerling rainbow trout infected with Myxobolus cerebralis​. Transactions of the American Fisheries Society 129:859-865. ​

Schisler, G. J., E. P. Bergersen, and P. G. Walker. 1999. Evaluation of chronic gas supersaturation on growth, morbidity, and mortality of fingerling rainbow trout infected with Myxobolus cerebralis. North American Journal of Aquaculture 61:175- 183. ​

Schisler, G. J., P. G. Walker, L. A. Chittum, and E. P. Bergersen. 1999. Gill ectoparasites of juvenile rainbow trout in the Upper Colorado River. Journal of Aquatic Animal Health 11:170-174.​