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Last modified
7/14/2009 5:02:35 PM
Creation date
5/17/2009 11:10:11 PM
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UCREFRP
UCREFRP Catalog Number
9384
Author
Valdez, R. A. and R. J. Ryel.
Title
Summary of Recovery Goals for the Four Endangered Fishes of the Colorado River Basin.
USFW Year
2000.
USFW - Doc Type
Logan.
Copyright Material
NO
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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 />
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