George J Schisler

Mountain whitefish (Prospoium williamsoni) are native to the Yampa and White River drainages in Colorado. Mountain whitefish population declines have recently been reported in Colorado in the Yampa River and its tributaries. The apparent onset of population declines in the decade after introduction of M. cerebralis in these locations raised the question of the role of whirling disease in these losses.

This angler survey was conducted in 2020 on a stratified sample of resident and non-resident Colorado anglers who purchased licenses in 2019. A total of 6,000 questionnaires were mailed out to 4,151 Colorado residents and 1,849 non-residents. Of these, 1,284 respondents completed the mail-in survey and 361 respondents completed the survey online through Qualtrics, providing a total sample size of 1,645 anglers, and a response rate of 27.4%. Angler...