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INTRODUCTTON ~ Bonytail (Gila elegans) and razorback sucker (Xyrauchen texam~s) were Federally listed as endangered under the authority of the endangered species act in 1980 and 1991, respectively. The Recovery Implementation Program for Endangered Fish Species in the Upper Colorado .River Basin (RIP) was implemented to recover Colorado pclceminnow (Ptycheilus Lucius), formerly known as Colorado squawfish, humpback chub (Gila cypha) and bonytail while allowing for ~ continued water development (USFWS 1987). When razorback sucker was Federally listed, recovery of this species was also included under the scope of the RIP. There are five primary components to achieving recovery of these four endangered fish species under the scope of the RIP: I. Instream Flow Identification and Protection; II. Habitat ~ Restoration; III. Reduce Nonnative Fish and Sportfish Impacts; IV. Propagation and Genetics Management; V. Research, Monitoring and Data Management. This revised stocking plan follows the direction of component IV. (Propagation and Genetics Management). Furthermore, this revised stocking plan is specific for razorback sucker and bonytail stocking efforts in the Green and Colorado rivers in Utah The purpose of this revised stocking plan is to provide a framework for stocking razorback sucker and bonytaii in Utah under the scope of the RIP. The primacy goal of this plan is to establish a minimum viable population of razorback sucker in the Green River and three minimum viable populations of bonytac~ in the Green and Colorado rivers. _~ Colorado pikemirmow and humpback chub are not referred to in this plan due to the currently stable populations that exist in Utah. Population estimates are currently being conducted on the Colorado pc~lceminnow populations in the middle and lower Green River. The results of these population estimates wdl determine the baseline for these populations toward achieving recovery ~ of this species (USFWS in draft). Lr7cewise, population estimates have been completed (Westwater Canyon), are currently being conducted (Desolation/Gray canyons), or are scheduled to begin (Cataract Canyon) for humpback chub populations in Utah. These populations may meet or exceed the minimum viable population criteria. required for downlisting aril subsequent delisting. However, if this does not prove to be the case, propagation and stocking of humpback ~ chub in Utah will need to be revisited. This stocking plan is a revision of the previous State of Utah Stocking Plan for Endangered Fishes in the Upper Colorado River Basin (Hudson et aL 1999). The primary purpose of the revision is to incorporate the minimum viable population objectives identified in the revised recovery goals ~ (LTSFWS in draft). These objectives are replacing the previous objectives identified in the Utah stocking plan based on the Interim Managec~nt Objectives (Lentsch et aL 1998). The framework provided in this plan will allow the minimum viable population objectives for the respective species to be met within ten yeazs. However, the objectives of this plan are not designed to maintain the minimum viable population objectives. Continued itnplemematian of components I. (Instream Flow Identification and Protection), II. (Habitat Restoration), and III. (Reduce Nonnative Fish and Sportfish Impacts) should provide for natural reproduction and recruitment into the adult population sufficient to sustain the respective minimum viable populations of razorback sucker and bonytail.