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allozymes, while informative, may not provide all the information necessary to differentiate stocks of RBS. Ten of those individuals were kept at the Horsethief Ponds Fish Culture Facility for broodstock. The same year, two wild females and one wild male were captured from the mainstem Colorado and added to the broodstock pool (M. Baker, FWS, Pers. comm. 2002). In 1995 one wild female was collected from the mainstem Colorado River near Grand Junction, Colorado, and added to the captive broodstock held at the Grand Valley Endangered Fish Facility. Captive reared RBS have been stocked into the Colorado/Gunnison subunit for several years (Burdick 2002). Production facilities that have contributed fish to the augmentation effort in this subunit include the Grand Valley Endangered Fish Facility, Grand Junction, Colorado; Ouary NFH, Vernal, Utah; Wahweap SFH, Utah; and Colorado's Mumma Native Aquatic Species Restoration Facility. Fish from the Colorado River mainstem, Green River, the Colorado River and San Juan River arms of Lake Powell, and Etter Pond have been stocked by these facilities into the Upper Colorado River. Representative broodstocks Upper Colorado River basin captive broodstocks are maintained at the Grand Valley Endangered Fish Facility, Ouray NFH, and Wahweap SFH (Table 1). The captive broodstock held, at the Grand Valley Endangered Fish Facility is comprised of Colorado River/Lake Powell stocks derived from nine females and eight males (C. McCada, FWS, Pers. comm. 2002). These fish were wild fish captured from the Colorado mainstem, Etter Pond, and the Colorado River arm of Lake Powell as described above. In 1994, two wild females and one wild male collected near Grand Junction and an Etter Pond male were mated in a 2 X 2 cross, resulting in four lots that form the basis of the current captive broodstock. Concurrently, six mature wild RBS captured in the San Juan arm of Lake Powell being held at Wahweap SFH, and four wild RBS from the Colorado River arm of Lake Powell held at Ouray NFH were transferred to Horsethief Ponds for future propagation efforts. In 1995, an additional wild female collected from the mainstem near Grand Junction was