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Last modified
7/14/2009 5:02:28 PM
Creation date
5/22/2009 4:42:26 PM
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UCREFRP
UCREFRP Catalog Number
1103
Author
Holden, P. B.
Title
Study of The Habitat Use and Movement Of The Rare Fishes In The Green River From Jensen To Green River, Utah, August and September, 1977
USFW Year
1977.
USFW - Doc Type
Final Report.
Copyright Material
NO
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<br />. <br /> <br />33 <br /> <br />. <br /> <br />squawfish used backwaters almost exclusively in the Colorado! River near <br />Grand Junction, although times of capture were not noted. <br />Small humpback chubs have similar habitat preferences tb small <br />squawfish but use more of a variety of areas, especially eddlies. No <br />previous study has reported on preferred habitats of small humpback <br />chubs. <br />Habitat preferences of adult humpback chubs have generallly incl uded <br />eddies near fast current (Holden and Stalnaker, 1975) and/o~ depths of <br />20+ feet (Kidd, 1977). The data collected during the presenlt study show <br />no distinct preference for either depth or velocity, although some hump- <br />backs were caught in very fast currents (2.5 fps) and in veny deep areas <br />(20 ft.). <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Concerning electivity curves, the Cooperative Instream Flow Service <br />Group has set guidelines for evaluating reliability based on number of <br />fish captured. They suggest the following reliability level!s: excellent, <br />200 individual measurements; good, 50-200 samples; and fair~ less than <br />50 measurements. Using these criteria, none of the curves ~hown above <br />can be rated excellent, young-of-the-year squawfish and hum~back chubs <br />are good, and the others only fair. The additional information from the <br />literature would probably increase the reliability of the young-of-the- <br />year squawfish data, but would add little reliability to th~ other groups. <br />It is doubtful that a two-month study of rare Colorado;Basin fishes <br />can produce sufficient data for excellent reliability, except for young- <br />of-the-year fish. The endangered status of the Colorado sq~awfish and <br />humpback chub suggest extreme rareness, as, in fact, they ate. Several <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />
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