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9 Increase sampling effort during the next abundance estimation sampling period to areas <br />where no sampling occurred in 2000 to 2003, if low and access conditions permit (e.g., Green <br />River between Tusher Wash Diversion downstream to Green River State Park, others). <br />• Investigate the need for, and the means to obtain, higher probabilities of capture of <br />Colorado pikeminnow in reaches where abundance estimates were relatively imprecise. This may <br />include addition of other gears such as fyke nets, or more sampling passes. <br />0 Investigate the efficacy and advantages of data collection to continue ISMP-type <br />sampling for catch-effort trends and to conduct the population rate of change analysis in years <br />when intensive abundance estimation sampling is not conducted. Benefits of such sampling will <br />need to be balanced against the potential negative effects of additional sampling on fish. <br />• Conduct an empirical analysis of growth and movements of Colorado pikeminnow, <br />based on tag recaptures, to further understanding of the ecology of Colorado pikeminnow in the <br />Green River Basin. <br />• Investigate the link between abundance dynamics of early life stages of Colorado <br />pikeminnow and recruitment to later life stages. An understanding of effects of habitat, stream <br />flow, and non-native fishes on recruitment would be especially useful. <br />ACKNOWLEDGMENTS <br />This study was funded by the Recovery Implementation Program for Endangered Fish <br />Species in the Upper Colorado River Basin. The Recovery Program is a joint effort of the U. S. <br />Fish and Wildlife Service (USFWS), U. S. Bureau of Reclamation (USBR), Western Area Power <br />Administration, states of Colorado, Utah, and Wyoming, Upper Basin water users, environmental <br />organizations, and the Colorado River Energy Distributors Association, and the National Park <br />61