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Last modified
7/14/2009 5:02:29 PM
Creation date
5/22/2009 4:39:43 PM
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UCREFRP
UCREFRP Catalog Number
7153
Author
Holden, P. B.
Title
Study of the Habitat Use and Movement of the Rare Fishes in the Green River, Utah.
USFW Year
1978.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
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<br />.~ <br /> <br />T <br /> <br />temperature as they were found in almost the entire range of <br />temperatures encountered during the study (Figure 5). <br />The six young-of-the-year razorbacks collected showed a pre- <br />ference for eddies with a velocity of about 0.2 fps (feet per sec- <br />ond) , a depth of 1.0 foot, and a soft silt bottom. <br />Humpback chub young-of-the-year (Desolation and Gray canyons <br />fishes) were less selective of microhabitat than were young squaw- <br />fish. The young-of-the-year chubs preferred backwaters with no <br />current, a firm silt bottom, and two feet of maximum depth, but <br />also used deeper eddies and runs with veloci~es from 0.4-0.8 fps <br />(Figure 6). Juvenile humpback chubs used a variety of habitats, <br />but preferred no current, a firm silt substrate, and a depth of <br />two feet (Figure 7). Adult humpback chubs were taken primarily <br />in eddies and runs with sand bottoms and a variety of velocities <br />and depths (Figure 8). Temperature did not appear to be selected <br />by any size of humpback chub (Figure 9). <br />Movement of young-of-the-year squawfish was studied in detail <br />in one backwater. The area was seined five different times during <br />a two-day period, and 4, 31, 29, 11, and 12 young-of-the-year <br />squawfish were caught, respectively (Table 2). The fish were anal <br />fin clipped during the first four samples and one recapture was <br />found in each of the last three samples. Marked fish were not <br />recovered in other areas near the test site although an extensive <br />seining effort was made to locate them. <br /> <br />~ <br /> <br />.'~f_. <br />
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