My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7300
CWCB
>
UCREFRP
>
Public
>
7300
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:29 PM
Creation date
5/24/2009 7:08:21 AM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7300
Author
Tyus, H. M. and C. A. Karp.
Title
Habitat Use and Streamflow Needs of Rare and Endangered Fishes, Yampa River, Colorado.
USFW Year
1989.
USFW - Doc Type
Biological Report 89(14),
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
37
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
Wick et al. 1985). During winter, adult Colorado <br />squawfish use backwaters (ephemeral along-shore <br />embayments), runs, and eddies, but are most common, <br />and presumably feed, in shallow, ice-covered shoreline <br />areas where large schools of minnows have been <br />observed (Wick and Hawkins 1989). Local <br />nonmigratory movements of adult Colorado squawfish <br />in nonbreeding seasons may be indicative of <br />home-range behavior (Tyus et a1.1987; Tyus 1989; Wick <br />and Hawkins 1989). <br />In spring and early summer in the Yampa River, adult <br />Colorado squawfish were most often located in <br />backwater habitats or flooded bottomlands. <br />Radio-tracking data indicated high use of shoreline <br />backwater habitat in 1981(a low-flow year; 66%, N = b <br />individual fish) and high use of flooded bottomlands <br />during 1983 (a high-flow year; 40%, N = 10). None of <br />the 10 fish located during 1983 were in backwater <br />habitat. Wick et al. (1983) noted that in 1982 (an <br />average-flow year), adult Colorado squawfish used <br />flooded shoreline areas in spring but moved to <br />backwater habitats as the river level dropped. High use <br />of flooded shorelines was also noted for adult Colorado <br />squawfish in the Green River during the 2 high-flow <br />years, 1983 and 1984 (Tyus et ~a1.1987). <br />Adult Colorado squawfish occupied a variety of <br />habitats in mid-to-late summer, but were most common <br />in eddies, pools, runs, and shoreline backwaters, over <br />sand and silt substrates (Fig. 5). Visual observations in <br />shallow water indicated that adults use sheltered <br />microhabitats behind boulders, flooded vegetation, or <br />other cover. During summer, radio-tagged fish were <br />most often located in deeper shoreline habitats, where <br />3b <br />F 30 <br />z <br />2b <br />a <br />w> <br />Vi <br />~~2~ <br />~m <br />ao <br />QQ~a <br />=O <br />~ 'lo <br />Z <br />W <br />U <br />W b <br />a <br />ED PO RI/RU BA RU SH MT MB FB RA <br />HABITAT TYPE <br />Fig. 5. Habitat use byradio-tagged Coloradosquawfish in the <br />Yampa River, June-August, 1981,85, 1987, 1988. ED = <br />eddy; PO =pool; RI/RU =riffle/run < 1.67 m depth; BA <br />=backwater; RU =run > 1.b7 m depth; SII =shoreline; <br />MT =mouth of tributary; MB =mouth of backwater; FB <br />= flooded bottom; RA =rapid. <br />193 <br />161 <br />129 <br />97 <br />64 <br />w <br />w 32 <br />O <br />-~ 555 <br />Y <br />o' <br />523 <br />iY <br />491 <br />~ 458 <br />z <br />~ a27 <br />394 <br />3b2 <br />Fig. 6. Movement patterns of radio-tagged Colorado <br />squawfish migrating to Yampa River spawning grounds, <br />1981-85, 1987, and 1988. Spawning reach is delineated by <br />(-__); 0 =midpoint of calculated optimum spawning <br />period for each year. Adjusted date scale in 28-day <br />increments. <br />movements suggested heavy use of eddy-run interface <br />(Tyus et al. 1987). <br />Spawning <br />Two major Colorado squawfish spawning migrations <br />have been identified by Service biologists in the Green <br />River basin by tracking radio-tagged fish. One migration <br />was discovered in the Yampa River and upper Green <br />River in 1981 (Tyus and McAda 1984), confirmed in <br />1982 (Wick et al. 1983), and again from 1983 to 1988 <br />(Tyus et a1.1987). Movement patterns of fish migrating <br />to the Yampa River spawning reach are presented for <br />1981-88 (Fig. 6). In May and early June, Colorado <br />squawfish began downstream migrations in the Yampa <br />and White rivers and upstream migrations in the Green <br />River to spawn in riffle and pool habitat of the lower <br />51.2 km of the Yampa Canyon (Fig. 4). The only other <br />confirmed Colorado squawfish spawning site in the <br />Green River basin is in Gray Canyon (RK 224-25b) of <br />the Green River (Tyus et a1.1987; U.S. Fish and Wildlife <br />Service, unpublished data). <br />6 <br />0 <br />ADJUSTED DATE <br />
The URL can be used to link to this page
Your browser does not support the video tag.