Laserfiche WebLink
<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 />