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4 individuals representative of presumptive genetic populations. Twenty-one wild, juvenile and adult razorback sucker (4 males, 3 females, 14 unknown sex) have been collected from the upper Colorado River and adjacent ponds (3 in 1988, 4 in 1990; 14 in 1991) and transferred to Dexter National Fish Hatchery (NFH), New Mexico since 1988. Unfortunately, only three of the original twenty-one razorback sucker are still alive. The remaining three fish (two females and one male) were transported from Dexter NFH to the Wray SFH, Wray, Colorado in May 1992. These fish form the nucleus of a captive broodstock. Attempts to capture wild stock from the upper Colorado and Gunnison rivers continue. However, if sufficient wild razorback sucker cannot be found wild fish from the closest population (the Colorado River arm of Lake Powell) may have to be used. Currently, six wild razorback sucker (two females and four males) captured from the Colorado River arm of Lake Powell are being held at the Ouray Endangered Fish Hatchery (EFH) near Vernal, Utah. Approximately 700 first-generation (Fl) fish are available from cross-paired matings of these fish (Steve Severson, pers. comm.). These progeny could be used to 1) develop F1 backup refugia broodstock, 2) provide potential production broodstock in addition to their utility as a genetic reserve, and 3) provide fish for various culture and field research activities that would include fish for immediate transfer to grow-out ponds that would eventually be experimentally released into the river. Several grow-out ponds may be identified and used to rear fish. Reclaimed gravel-pit ponds along the Colorado River in western Colorado will likely be used. Six earthen ponds (four three-quarter surface acre and two one-quarter surface acre) on the Horsethief State Wildlife Area west of Grand 18 4 4 a 4 4