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003J94 COLORADO RIVER RECOVERY PROGRAM FY 2000 ANNUAL PROJECT REPORT RECOVERY PROGRAM PROJECT NUMBER: 22-A-2 I. Project Title: MONITORING THE COLORADO PIKEMINNOW POPULATION IN THE MAINSTEM COLORADO RIVER VIA PERIODIC POPULATION ESTIMATES n. Principal Investigator(s): Frank K. pfeifer, Project Leader Douglas Osmundson, Fishery Biologist U. S. Fish and Wildlife Service 764 Horizon Drive, Building B Grand Junction, Colorado 81506 (970) 245-9319: Fax 245-6933 Frank _Pfeifer@FWS.gov Doug_ Osmundson@FWS.gov m. Project Summary: The Interagency Standardized Monitoring Program (ISMP) was developed in 1986 to monitor population trends of Colorado pikeminnow and humpback chub in the Colo~ado River Basin using catch per effort (CPE) indices. ISMP was expanded in 1998 to include mark-recapture population estimates of the major Colorado pikeminnow and humpback chub populations. For Colorado pikeminnow, CPE data collection continued through 2000 and data were incorporated into those used to develop population estimates. This report summarizes major results of the 3-year effort to develop new population estimates of Colorado pikeminnow in the Colorado River. Data 'collection efforts by the project biologist have been completed on schedule, all data have been entered and some analyses have already been run. The project concludes in 2001. N. Study Schedule: 1998-2001. V. Relationship to RIPRAP: Colorado River Action Plan: Colorado River Mainstem V. Monitor populations and habitat and conduct research to support recovery actions. V.A Conduct research to acquire life history information and enhance scientific teclmiques required to complete recovery actions. VI. Accomplishment ofFY 99 Tasks and Deliverables, Discussion of Initial Findings and Shortcomings: Tasks 1. Capture and mark subadult and adult Colorado pikeminnow in the Colorado River 22-a-2-1