My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7171
CWCB
>
UCREFRP
>
Public
>
7171
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/11/2009 11:32:55 AM
Creation date
8/10/2009 3:09:05 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7171
Author
Meyer, C. W. and M. Moretti.
Title
Fisheries Survey of the San Juan River, Utah 1987.
USFW Year
1988.
USFW - Doc Type
Pub. No. 88-1,
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
61
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
s <br />Flannelmouth sucker were consistently more prevalent than <br />_-- bluehead sucker in electrofishing collections. Channel catfish were <br />slightly more abundant than bluehead sucker in both spring and summer <br />~ (Table 6). The relative abundances of carp and unidentified suckers <br />were not significantly different (P=0.05) between spring and summer <br />(Table 6). The relative abundances of flannelmouth and bluehead <br />suckers, and channel catfish were significantly greater in summer than <br />in spring (P=0.05; Table 6). The increase in catch rates in summer <br />was probably due to greater effectiveness of electrofishing in <br />~ shallower depths and--lower water velocities. <br />Only one rare or endangered species was found during UDWR's <br />summer electrofishing -- Colorado squawfish. Flannelmouth X bluehead <br />sucker hybrid and striped bass were only occasionally encountered in <br />both spring and summer electrofishing. Two rainbow trout were <br />~ collected during spring high flows. <br />In addition to the seasonal differences in fish abundances noted <br />above, spatial differences were also observed. There was a trend of <br />increasing relative abundances of carp, flannelmouth, bluehead and <br />unidentified suckers with relative distance upstream (Figures 4, 5, 6 <br />and 7, respectively). Relative abundance of channel catfish tended to <br />decrease with relative distance upstream (Figure 8). There is a <br />- striking difference in geomorphology of the San Juan River above and <br />below RMI 78 (i.e., between Reach Code 16 and 17). From RMI 78 <br />downstream to Lake Powell, the river is confined to a single channel <br />- within a deep canyon. From RMI 78 upstream, the river meanders <br />~ through a relatively broad floodplain and forms braided channels. The <br />average relative abundances of carp, flannelmouth, bluehead and <br />unidentified suckers were significantly greater in the upstream <br />braided reaches of the river than in the lower non-braided canyon <br />reaches (Table 7). Channel catfish abundance, conversely, was <br />significantly greater in the lower canyon reaches versus the upper <br />~ braided reaches (Table 7). Electrofishing catches of BOR in the <br />river-lake transition zone were dominated by exotic species. Channel <br />catfish was the most prevalent species in BOR collections, followed by <br />carp (Table 4). <br /> <br /> <br /> <br />~ - 17 - <br />
The URL can be used to link to this page
Your browser does not support the video tag.