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I I I I I I I I I I I I I I I I I I I Workshop on Population Estimates for Colorado Pikeminnow and Humpback Chub December 6-7,2001 Division of Water Resources National Park Service 1201 Oak Ridge Drive 3rd Floor Conference Room Fort Collins, Colorado Purpose: The U.S. Fish and Wildlife Service (Service) is requesting guidance in determining acceptable population estimates for the Colorado pikeminnow and humpback chub. Objective: To bring together experts on population estimates for Colorado pikeminnow and humpback chub for focused examination of the statistical validity of existing and future estimates to provide guidance to the Service on those that should be accepted toward tracking population trends as required by the demographic criteria of the draft recovery goals. Schedule and Presenters: December 6, 2001 9:00-9:15 1) Introduction - Bob Muth, Moderator, and Susan Baker, Service representative 9: 15-9:30 2) Ground rules - Bob Muth 9:30-10:10 3) Overview of what is required in the recovery goals a) numbers and trends - Tom Czapla (9:30-9:45) b) rationale behind the recommended statistics - Rich Valdez and Ron Ryel (9:45-10: 1 0) 10: 10-10:45 4) Assumptions/limitations of mark-recapture population estimate models - Kevin Bestgen 10:45-11 :00 Break 11:00-11:50 5) SESSION A: Population estimates for Colorado pikeminnow and associated methods [speakers should focus on data relevant to the population estimates and determination of recruitment of age-5 and age-6 fish (i.e., 1ength- frequency distributions); the approach and assumptions in developing the estimates; and recommend first acceptable estimate]