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Last modified
7/14/2009 5:02:34 PM
Creation date
5/20/2009 10:09:50 AM
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UCREFRP
UCREFRP Catalog Number
8232
Author
Burdick, B. D.
Title
Evaluation of Fish Passage at the Grand Valley Irrigation Company Diversion Dam on the Colorado River Near Palisade, Colorado.
USFW Year
1999.
USFW - Doc Type
CAP-17,
Copyright Material
NO
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EXECUTIVE SUMMARY <br />The purpose of this study was to evaluate whether sub-adult and adult <br />Colorado pikeminnow and other native fishes would move upstream through a series <br />of newly-constructed alternating pools and riffles and a notch in the Grand <br />Valley Irrigation Company (GVIC) Diversion Dam on the Upper Colorado River near <br />Palisade, Colorado. Study direction was modified in August 1998 that resulted <br />in altering tagging techniques for the remainder of 1998 and canceling field <br />sampling for most of 1999. Consequently, most of the stated study objectives <br />were not sufficiently addressed. <br />Methodology for this evaluation relied on two separate techniques, 1) mark <br />and recapture using electrofishing, and 2) telemetry, both applied independently <br />to determine if sub-adult and adult fish would use the passageway to pass by the <br />GVIC Diversion Dam. Sub-adult and adult fish of the most common large-sized, <br />native fishes (flannelmouth sucker, bluehead sucker, and roundtail chub) were <br />inserted with a PIT tag; other common sub-adult and adult nonnative fishes such <br />as common carp and white sucker were marked with an external, individual, <br />serially-numbered Floy° tag. Rainbow trout, brown trout, and sucker hybrids were <br />all marked by clipping the left pelvic fin. Only fish captured downstream of <br />the GVIC Diversion were marked or tagged. Centrarchids and ictalurids captured <br />up- and downstream of the GVIC Diversion Dam as "by-catch" were removed and <br />disposed. Sampling to recapture fish upstream of the diversion dam was conducted <br />once prior to- and 10 times following runoff. Eight days each were dedicated to <br />sampling downstream of the diversion dam to recapture fish prior to- and <br />following runoff. <br />The second method incorporated a digitally encoded telemetry system to <br />follow movements of sub-adult and adult Colorado pikeminnow captured in the 15- <br />mile reach that had been implanted with LOTEK~-coded transmitters. Ground <br />surveillance was used to monitor fish movements from a boat and by a fixed, land- <br />based tracking station and data logger, located at the diversion dam, that <br />constantly monitored and recorded signals automatically from transmitter-tagged <br />fish immediately downstream and immediately upstream of the diversion dam. <br />Summary results from this research were: 1) no transmitter-tagged sub-adult <br />or adult Colorado pikeminnow were documented using the newly-constructed notch <br />to pass by the GVIC Diversion Dam; 2) ten adult Colorado pikeminnow were captured <br />upstream of the diversion dam. It is unknown whether these 10 fish had used the <br />notch at the diversion dam or simply passed over the diversion structure when it <br />was inundated during high water in 1998 or during prior years; 3) 2,505 fish were <br />captured upstream of the diversion dam prior to spring runoff (27 April) and <br />during post-runoff (17 July to 21 October). Of the 1,815 native and nonnative <br />fish that were marked downstream of the GVIC Diversion Dam, only one adult carp <br />was recaptured upstream of the diversion dam. This fish was assumed to have used <br />the drop structure and notch to pass by the diversion dam because there was no <br />water spilling over the diversion dam during the one-week period between marking <br />and recapture; and 4) forty-six fish were recaptured downstream of the GVIC <br />Diversion Dam--forty were native fish and six nonnative fish. Recapture rate was <br />2.5% of all fish marked. <br />viii <br />
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