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Last modified
7/14/2009 5:02:31 PM
Creation date
5/20/2009 10:11:03 AM
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UCREFRP
UCREFRP Catalog Number
7747
Author
Burdick, B. D. and L. R. Kaeding.
Title
Biological Merits of Fish Passage as Part of Recovery of Colorado Squawfish in the Upper Colorado River Basin.
USFW Year
1990.
USFW - Doc Type
Grand Junction, CO.
Copyright Material
NO
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might vary dramatically among barrier types (e.g., complete versus partial barriers), <br />their locations within the range of the species (e.g., center of range versus peripheral <br />areas), and possible additional factors. <br />When fish passaaeways may not be warranted <br />Installing fish passageways at barriers in reaches near the upstream limits of the <br />squawfish's historic range may not be warranted if the effect of passageway use is <br />solely to provide access to habitat that is not currently limiting the population. If <br />juvenile and adult habitats are not limiting in reaches currently occupied, providing <br />access to more habitat in other reaches may not necessarily benefit the population. <br />An example of this might be found in the Colorado River reach above the Grand Valley <br />Diversion. This low-head irrigation diversion is the first in a series of three irrigation <br />diversions in river reaches near the upstream limits of both present and historic range <br />of squawfish. Fish that move upstream over the Grand Valley Diversion would <br />encounter another barrier, the medium-head Price Stub Dam (Figure 1). <br />If the dam does not have a spillway, downstream movement of all size classes of <br />fish would depend on the fish's ability to locate and use the fish passageway. <br />Moreover, before reaching the passageway fish moving downstream would have to <br />pass through a reservoir environment, which could further confound their ability to <br />locate the passageway. They might not locate the passageway. Conversely, fish that <br />successfully use a fish passageway and move upstream into the reservoir might <br />become isolated from the reproducing population; their loss could have an important <br />negative effect on population maintenance. While in the reservoir the squawfish might <br />7
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