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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 5:01:43 PM
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UCREFRP
UCREFRP Catalog Number
9319
Author
Mueller, G., M. Horn, Q. Bradwisch and L. Boobar.
Title
Examination of Native Recruitment and Description of the Fish Communities Found in the San Jan and Colorado River Interface Zones of Lake Powell, Utah.
USFW Year
2001.
USFW - Doc Type
01-159,
Copyright Material
NO
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<br />Past studies have collected tens of thousands of fish from the Colorado River inflow, however, <br />sampling may have been biased toward either small or large fish (Valdez and Cowdell 1994a and <br />1994b, Muth and Wick 1996 and 1997). Seining, larvalli~~:ht traps, and electrofishing were the <br />primary methods used. Seining was effective for small fi~h not large fish. Unfortunately, steep <br />muddy banks, deep channels, and brush or debris make seir,ing difficult. Larger fish are more <br />susceptible to electrofishing, but turbidity decreases the likelihood of seeing and netting the fish. <br />Because of these limitations, it was speculated that juvenile natives may have avoided detection <br />and capture. <br /> <br />We used standard sampling methods to target all life stages, especially juvenile fish. These <br />included custom built minnow traps, hoop nets, and 1.2-cm and 3.7-cm trammel nets. Many of <br />the techniques have been developed for razorback sucker culturing programs in the Lower Basin <br />(Tom Burke, Bureau of Reclamation [BOR] and Chuck Minckley, Fish and Wildlife Service <br />[FWS] personal communique). To our knowledge, these methods had not been widely used in <br />the Upper Basin. <br /> <br />Glen Canyon National Recreation Area recently developed an Adaptive Management Program to <br />examine management issues for natural resources within the park's boundaries. A major <br />program component is to better understand the influence that reservoir operation has on native <br />and nonnative fish communities both upstream and downstream of Glen Canyon Dam. This <br />study attempts to address some of those key issues. <br /> <br />METHODS <br /> <br />Sampling Schedule <br /> <br />Sampling started on Monday and was completed by Thursday of each trip. Five trips were <br />conducted on the San Juan Arm both in 1999 and 2000 (Table 1). The Colorado River inflow <br />was examined once in the spring of 1999 and twice in 2000. The schedule follows: <br /> <br />1999 <br /> <br />Table 1. Lake Powell Inflow sampling schedule <br /> <br />2000 <br /> <br />Colorado River April 12th <br />San Juan River* May 10th, June 14th, July 12th, August 16th, October 4th <br /> <br />Colorado River April3rd, May 15th <br />San Juan River* May P1, June 5th, June 26th, July 17th, August 2Pt <br /> <br />* included both the inflow and Spencer's Camp (control) sites <br /> <br />2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />,I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />il <br />I <br />I <br />I <br />I <br />
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