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Last modified
7/14/2009 5:02:37 PM
Creation date
5/24/2009 7:11:02 AM
Metadata
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UCREFRP
UCREFRP Catalog Number
9673
Author
Tyus, H. M. and G. B. Haines.
Title
Distribution, Habitat Use, and Growth of Young Colorado Squawfish in the Green River Basin, Colorado and Utah - Preliminary Report.
USFW Year
n.d.
USFW - Doc Type
Vernal, UT.
Copyright Material
NO
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provision of a proper flow regime to optimize backwater habitats, i.e., <br />summer flows more like historic conditions. <br />Growth and survival.-We expected greater growth and better overwinter <br />survival of age-0 fish in the lower Green River because of warmer water. <br />However, we found that age-0 fish in the upper nursery area were the same <br />average annual size, and even larger than the lower area. We assume that <br />other environmental factors, (e.g., habitat availability and food <br />abundance) are more important for growth in some years, at least. <br />Reduced relative abundance and growth of age-0 fish in 1983 and 1984 <br />was attributed to abnormally high summer flows from Flaming Gorge Dam. <br />These flows inundated nursery habitats and reduced water temperatures in <br />the upper Green River. Low summer flows, however, were associated with <br />greater catches of age-0 fish and growth. Although it was impractical to <br />count all backwaters by boat because of the width of the river and limited <br />manpower, we observed fewer backwaters during high flow years (1982,1983 <br />and 1984) and more during low and average flow years (1979-1981, 1987- <br />1988). These observations were similar to results of a Bureau of <br />Reclamation study conducted 1986-1988 on four reaches of the Green River. <br />Using aerial photographic mapping of shoreline habitats at different water <br />levels, they found that backwaters were reduced in area when flows in the <br />Green River increased above average historic summer flows (M. Pucherelli, <br />U.S. Bureau of Reclamation, personal communication). Thus, high flows not <br />only reduced catches, but also reduced the total amount of backwater <br />habitat available. We were concerned that higher flows might have reduced <br />our success in catching young fish in 1983 and 1984, and biased our <br />results. However, spring sampling in 1984 produced only one age-1 <br />16 <br />
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