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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 />20 <br /> <br />. <br /> <br />variety of habitats, but preferred no current, a finn silt substrate, and <br />a depth of two feet (Figure 8). Adult humpback chubs were taken primarily <br />in eddies and runs with sand bottoms and a variety of velocities and <br />depths (Figure 9). Temperature did not appear to be selected by any size <br />of humpback chub (Figure 10). <br />Turbidity varied considerably during the study, and was highest after <br />rainstorms (Figure 11). There is considerable natural variation in the <br />turbidity levels of the Green River because the watershed is highly erod- <br />able. The native fishes seldom have the opportunity to select a preferred <br />turbidity as the entire river may change dramatically overnight. . They <br />are well adapted to sudden and extensive changes in turbidity, which are <br />usually associated with increases in flow. <br />River cross-sectional measurements of depth, velocity, and substrate <br />were taken around a backwater where young-of-the-year squawfish were abun- <br />dant. Figures 12 and 13 show the depth and velocity iso1ines of the area <br />measured. The area was quite deep, with steep, sloping banks and a well- <br />defined main current with slower areas near the shore. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Chemical Components <br />Graphs of water chemistry values recorded during the study can be <br />found in Appendix II. Green River water chemistry changed little during <br />the course of the study. Fluctuations of the various parameters are with- <br />in the normal expected range. Fishes seldom are able to select preferred <br />chemical ranges in the river as all habitats are very similar in chemical <br />analysis. <br /> <br />. <br /> <br />~ <br /> <br />. <br />
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