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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 />Temperature and dissolved oxygen readings were periodically recorded in the <br />~ late summer and during the winter through the ice. These readings were recorded <br />during the 1999 - 2000 winter and summer of 2000. Water quality readings were <br /> <br />measured with a Hydrolab O water quality monitoring instrument. <br />Monitoring movement to the river <br />To monitor razorback sucker movement from the sites, traps were set in levee <br />~ breaches at each site prior to connection. There was only one levee breach to monitor <br />at The Stirrup and Baeser Bend. However, Above Brennan had multiple breaches. <br />The traps to capture fish were set in the downstream breach. Attempts were made to <br />~ prevent fish movement from the site through the other four breach locations by setting <br />block nets. However, this did not work well because high water flows eroded the <br />substrate under the nets and created holes that fish could pass through. <br />Traps were set at all three sites in 1999 and 2000. Above Brennan was the only <br />site sampled in 2001. During 1999, the traps were constructed from 6 mm mesh plastic <br />~ netting and 2.5 cm diameter plastic tubing. They consisted of two side leads and a <br />chamber with a single funnel (Figure 5). In 2000, these plastic mesh traps were <br />replaced with specially designed fyke nets that were 19 mm mesh, with three 1.2 m x <br />~ 1.5 m rectangular frames, three hoops and one funnel (Figure 6). The funnel opening <br />was positioned at the bottom of the net for shallow water fishing. Both trap types were <br />placed in lowest point of the levee breaches (parallel to the cut), with leads extending <br />t <br />out to the right and left outer banks of the cuts. One trap was set to catch incoming fish <br />and the other to catch outgoing fish. Traps were checked daily during the river- <br />~ floodplain connection period. All captured razorback sucker were weighed, measured <br />9 <br /> <br />
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