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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 7:31:32 PM
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UCREFRP
UCREFRP Catalog Number
9523
Author
Birchel, G. J. and K. Christopherson.
Title
Survival, Growth and Recruitment of larval and Juvenile Razorback Suckers (Xyrauchen texanus) Introduced into Floodplain Depressions of the Green River, Utah.
USFW Year
2004.
USFW - Doc Type
Vernal.
Copyright Material
NO
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<br />previously discussed survival estimates, indicate most razorbacks stocked in 1999 <br />~ remained in the sites. <br />In 2000, the river-floodplain connection period occurred between 24 May and 7 <br /> <br />June. Because of below average spring flows connection durations in 2000 were <br />considerably shorter than 1999 durations. Connection durations were 15 days at Above <br />Brennan, seven days at Baeser Bend and only three days at The Stirrup. Low spring <br />~ flows also resulted in shallow water depths at connection points, particularly at The <br />Stirrup and Baeser Bend (Figure 6). Water depth during connection was only 5 cm (2 <br />inches) at The Stirrup and about 30 cm (12 inches) at Baeser Bend. During this <br />~ connection period, 31 age-2 razorback sucker were caught in outgoing traps at Baeser <br />Bend, ten at Above Brennan and one at The Stirrup (Table 2). <br />s <br />Above Brennan was the only site where breach traps were set in 2001 and no <br />razorback sucker were captured leaving the site. However, traps were only placed in <br />the downstream breach. Therefore, undetected movement from the site could have <br />r easily been accomplished through any of the upstream breaches. <br />Monitoring dispersal in the river <br />Razorback sucker that were originally stocked in the study sites in 1999 were <br />~ caught in the Green River during sampling efforts for other projects in 2000 and 2001 <br />(Appendix A, Tables 5 - 7). Most of the fish caught while sampling in the river had not <br />been caught in breach traps. This suggests the breach traps were not effective at <br />monitoring movement out of the floodplain site. During abundance estimate sampling <br />for Colorado pikeminnow (Hawkins 1999) in 2000, 41 individual razorback sucker were <br />captured (Table 2 and Appendix A, Table 5). Nineteen of these razorback sucker were <br />17 <br /> <br />
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