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182 VALDEZ AND MUTH than 150 mm TL) were marked with PIT tags. Since 2003, the hatcheries have been producing fish to meet the current integrated stocking plan (Nesler et al. 2003) and to maintain broodstocks. A genetics management plan (Czapla 1999) provides guidance for culture, propagation, and stocking, and annual operations plans identifY num- bers of fish to be stocked. The UCRRP funds op- erations of four hatchery facilities in Colorado and Utah that culture and raise endangered fish: 1. The state ofColorado'sJ.W MummaNa- tive Aquatic Species Restoration Facility (Alamosa, Colorado) raises bony tail andColorado pikeminnow. 2. The state of Utah's Wahweap Fish Hatch ery (Big Water, Utah) raises bonytail. 3. The Ouray National Fish Hatchery (Ouray, Utah) raises razorback sucker. 4. The Recovery Program's Grand Valley En- dangered Fish Facility (Grand Junction, Colorado) raises razorback sucker. Guidance for stocking endangered fish is pro- vided by an integrated stocking plan (Nesler et al. 2003) for the upper Colorado River basin designed primarily to expedite reestablishment of razorback sucker and bonytail populations and to reestablish Colorado pikeminnow in presently restricted or in- accessible reaches of historic habitat. This stocking plan integrates the separate state stocking plans and ensures consistency throughout the upper Colorado River basin for stocking endangered fish and evalu- ating success. Stocking priorities are: · Razorback sucker are to be reestablished in the upper Colorado River and Green River subbasins (i.e., one population in the Colorado and Gunnison rivers, one in the middle Green River, and a redundant population in the lower Green River). Tar- get size of stocked razorback sucker is 300 mm TL (i.e., age 2+), and stock- ing is scheduled for fall with 9,930 fish stocked per population annually for 6 years. · Bonytail populations are to be reestablished in alluvial reaches of the upper Colorado River and Green River subbasins (i.e., one population in the Colorado River, one in the middle Green River, and a redundant population in the lower Green River). Tar- get size of stocked bonytail is 200 mm TL (i.e., age 2+), and stocking is scheduled pri- marily in fall with 5,330 fish stocked per population annually for 6 years. By ac- cepting the State of Colorado's stocking plan, the UCRRP has deemed that stock- ing bonytail in the proximity of existing humpback chub populations is an "accept- able" risk regarding the potential of hy- bridization between the species. · Colorado pikeminnow are stocked in re- stricted or inaccessible reaches of historic habitat in the Colorado River above the Grand Valley Water Project Diversion Dam and in the Gunnison River above the Redlands Diversion Dam. Target size of stocked Colorado pikeminnow is 150 mm TL (i.e., age 3+), and stocking is scheduled primarily in fall with 1,125 fish stocked per reach annually for 8 years. This effort will be reevaluated if stocked Colorado pikeminnow are not retained within the stocking reaches. · Humpback chub is not anticipated to be stocked. However, augmentation of exist- ing small populations may become neces- sary. Relocation of young from nearby populations or stocking to expand popu- lations of humpback chub into the Yampa, Lodore, Whirlpool, and Split Mountain complex may be desirable in the future to meet recovery needs. Stocking of hatchery fish is an important element of recovery program activities, and the most suitable stocking strategies and growth and survival of stocked fish continue to be evaluated. Razorback sucker were first stocked in the Gunnison River near Delta, Colo- rado, in 1995, and 5 stocked fish used the Redlands fish passage in 2001 and one in 2002. Stocking plans were revised to stock fewer but larger fish in 2001, and larval razorback sucker were discovered in the Gunnison River in 2002 and 2003, indicating that stocked fish had successfully reproduced. Ripe stocked adults have been found on the spawning