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Last modified
7/14/2009 5:02:36 PM
Creation date
5/20/2009 10:07:40 AM
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UCREFRP
UCREFRP Catalog Number
9499
Author
Osmundson, D. B.
Title
Removal of Non-native Centrarchids from Upper Colorado River Backwaters, 1999-2001
USFW Year
2003.
USFW - Doc Type
Summary of Results.
Copyright Material
NO
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<br />U.0 <br />Largemouth bass <br />0.4 --------------- --------------------------------------------------------------------------- --------------------- <br />0.3 ------------------------------------------------------------------------------------------ ---------------------- <br />0.2 ----------------------------------------------------------------------------------- --------------- <br />N <br />0.1 -------------------------------------------------------------------- <br />0 <br />V- _OJE, <br />Z: 0 86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 <br />N <br />-? 2 <br />E <br />I <br />z 1.5 <br />1 <br />0.5 <br />0 <br />Green sunfish <br />------------------ ------------------ ------------- ------------------ -------- ----------------------- <br />---- ---------------------- -------------- <br />---- ----------------------- ------- <br />86 87 88 89 90 91 92 93 94 95 96 97 98 99 0 1 <br />Year <br />Figure 8. Annual catch per effort (fish/10 m2 seined) of largemouth bass (top) and green <br />sunfish (bottom) during ISMP monitoring, 1986-2001. <br />Response of Endangered Fish to Non-native Fish Removal Efforts <br />Relative abundance of YOY Colorado pikeminnow is monitored annually in the <br />target reach as part of the Interagency Standardized Monitoring Program (ISMP). No <br />reproduction of stocked razorback sucker or bonytail has yet been detected in the upper <br />Colorado River. Humpback chub are known to reproduce in or near Black Rocks and <br />Westwater Canyon (downstream of the target area) but YOY numbers are not annually <br />18
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