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<br />Table AI. Continued. <br />Studies <br />Project 140 (continued) <br /> <br />Chemically <br />fingerprinting <br />nonnative fishes in <br />reservoirs (project <br />C18/19) <br /> <br />Yampa River pike <br />sources (Project 143) <br /> <br />Study Goal and Objectives <br /> <br />Objectives <br />1. Select treatment and reference areas for study. <br />2. Implement removal of smallmouth bass and northern pike in treatment reaches in spring <br />(mostly conducted in a different study). <br />3. Assess abundance of predators in treatment and reference reaches to determine removal effects. <br />4. Conduct additional removals prior to summer if removals were not sufficient or if the removal <br />effect was transitory. <br />5. Estimate response of native fishes in autumn after spring-summer predator removal. <br />Goal <br />To determine chemical "fingerprints" of nonnative fishes in reservoirs that are potential sources <br />of nonnative fishes to critical habitat. <br />Objectives <br />1. Quantify chemical "fingerprints" of fishes within study reservoirs and evaluate degree of inter- <br />annual variation in those fingerprints. <br />2. Determine if fish sampled in rivers the vicinity of study reservoir possess otoliths core <br />signatures that identify them as having originated from one of the study reservoirs. <br />3. Improve our understanding of the degree to which immigration or transfers from reservoirs <br />contributes to the load of nonnative fishes in critical habitat of the Upper Colorado River Basin. <br />4. Provide recommendations to guide management efforts to reduce the influx of nonnative fishes <br />from reservoirs. <br />Goal 1. <br />Map degree of movement of pike within the Yampa River system via otoliths microchemistry. <br />Objectives 1. <br />1. Demonstrate differences in chemical signatures of otoliths of age-O pike from various sources. <br />2. Evaluate how quickly differences can be detected via laser ablation. <br />3. Estimate the proportion of pike recruited from reservoirs and other spawning areas in the <br />Yampa River. <br />4. Estimate the extent of pike movement from spawning sources and reservoirs to other habitats <br />within the Yampa River system. <br />Goal 2. <br />Evaluate trophic relationships of pike within Stagecoach Reservoir, Lake Catamount, Elkhead <br />Reservoir, and portions ofthe Yampa River using stable isotope analysis. <br /> <br />Status <br /> <br />Ongoing <br /> <br />Ongoing <br /> <br />FY <br /> <br />2006 - <br />2009 <br /> <br />2005 - <br />2006 <br /> <br />~ <br />~ <br />~ <br />~ <br />::ti <br />V:l <br />"-3 <br />8 <br />~ <br /> <br />~ <br /> <br />:> <br />I <br />...... <br />o <br /> <br />~ <br />~ <br />$;! <br />~ <br /> <br />-'" <br />'" <br />c <br />C <br />'-l <br />