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<br />concentration areas and habitats that attract northern pike. <br /> <br />There was evidence of northern pike predation attempts on Colorado <br />pikeminnow as large as 799 mm TL. Injuries attributed to northern pike were observed <br />on 18% of all Colorado pikeminnow handled and injury rate of newly handled fish <br />increased each year. Prey removed from live northern pike included roundtail chub Gila <br />robusta, flannel mouth sucker Catostomus latipinnis, and bluehead sucker <br />C. discobolus. Prey consumed by northern pike were as large as 72% of the predator <br />length. <br /> <br />Conclusions <br />. Objective 1 was accomplished. Northern pike juveniles and adults were <br />captured using electrofishing and fyke nets and removed from the Yampa River. <br />· Objective 2 was accomplished. Northern pike were moved to ponds in the <br />Yampa River drainage and a reservoir in the White River Valley and mortality of <br />handled fish was very low (4%). <br />· Objective 3 was accomplished. Effectiveness of removal in reducing the number <br />of northern pike of all sizes or reducing the number of large northern pike was <br />evaluated. <br />. Removal was most successful in Lily Park, the most downstream reach, <br />apparently because the reach was located the farthest from upstream sources of <br />reproduction and recruit-sized fish. <br /> <br />vii <br />