I. Project Title: Nonnative fish removal in the Duchesne River. II. Principal Investigator(s):

channel catfish Ictalurus punctatus, and northern pike Esox lucius, are common to abundant in the Duchesne River (Tyus et al. 1982,Cranney 1993). These fish were introduced at various times to provide sport fishing at various locations throughout the Colorado River Basin and Green River sub-basin, and all three have been identified as major or strategic threats to the recovery of endangered fishes throughout the Upper Colorado River Basin (Crowl 1995, Tyus and Saunders 1996, Hawkins and Nesler 1991). The goal of this project is to improve survival of endangered fish in the Duchesne and Green Rivers. To achieve this goal, the Duchesne River was divided into four reaches between the Myton Diversion and the confluence with the Green River and three electrofishing passes on each shoreline were made through each reach to mechanically remove nonnative fishes. Sixty-one channel catfish and 100 smallmouth bass were removed from the Duchesne River in 2005. No northern pike were removed or identified by field crews