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<br />Razorback Sucker - 2 <br /> <br />4. Implement nonnative fish control, as needed, to recover the razorback sucker. <br /> <br />Gila River Subbasin <br />1. Provide and legally protect flows necessary to recover the razorback sucker. <br />2. Develop and implement agreements to regulate stocking and releases of nonative <br />fishes that may prey on or compete with razorback suckers. <br />3. Implement nonnative fish control, as needed, to recover the razorback sucker. <br /> <br />Lower Colorado River <br />1. Provide and legally protect flows necessary to recover the razorback sucker. <br />2. Develop and implement agreements to regulate stocking and releases of nonative <br />fishes that may prey on or compete with razorback suckers. <br />3. Implement nonnative fish control, as needed, to recover the razorback sucker. <br /> <br />B. Objective, Measurable Recovery Criteria <br /> <br />Downlisting Criteria <br />Downlisting of razorback sucker from endangered to threatened will be considered when <br />the following criteria are met: <br /> <br />Lake Mohave <br />1. Maintain at least 50,000 adults for genetic viability for at least 5 years as wild <br />genetic refugia, <br /> <br />Green River Subbasin <br />1. A minimum estimated population of 4,500 adults for a period of 5 years, such <br />that: <br />a. the lower 95% confidence interval of the estimated population of adults <br />exceeds 4,500, <br />b. a trend in adult population point estimates for the same 5-year period that <br />does not decline significantly, and <br />c. a proportion of age 3 fish for each year that is not significantly higher than <br />30% or lower than 20% of the adult population for the same 5-year period. <br />2. Provide flows necessary to recover the razorback sucker, including tributaries <br />necessary to life history; i.e., Yampa, White, Duchesne, and Price rivers. <br />3. Procure and protect habitats necessary to recover the razorback sucker, including <br />flooded bottomlands. <br />4. Implement activities to successfully expand the range of the population of the <br />Green River subbasin and enhance recruitment; i.e., maintain unimpeded fish <br />passage within occupied habitats, minimize entrainment in the Green River Canal. <br />5. Implement nonnative fish control, as needed, to recover the razorback sucker. <br />6. Investigate and determine if selenium has a significant negative effect on <br />reproductive success and survival of razorback sucker. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />