My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7325
CWCB
>
UCREFRP
>
Copyright
>
7325
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:01:45 PM
Creation date
5/22/2009 6:20:35 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7325
Author
McNatt, R. M. and D. L. Skates.
Title
Fishery Investigation of the Yampa and Green Rivers, Dinosaur National Monument, Colorado and Utah, 1981.
USFW Year
1981.
USFW - Doc Type
91-100.
Copyright Material
YES
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
10
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
<br />93 <br />Two native suckers, Catostomus discobolus and Catostomus latipinnis <br />were abundant throughout both rivers in the Monument (Tables 2 and 31. <br />Numbers of these two species were approximately equal in the Yampa and Green <br />rivers downstream to Echo Park, but Catostomus discobolus was noticeably <br />more abundant further downstream (Table 3). Gila spp. (including G. robusta) <br />occurred throughout the monument, but were uncommon in the Green River below <br />Whirlpool Canyon. Rhinichthys osculus and Gila robusta were abundant in <br />seine hauls throughout both rivers in the monuments. <br />Two introduced species, Cyprinus carpio and Ictalurus punctatus? <br />were common in trammel net and electrofishing samples throughout the <br />monument (Table 3). Both these species- reached weights in excess of 5 kg. <br />Rhinichthys osculus and Notropis lutrensis were abundant in seine hauls <br />throughout both rivers. Pimephales promelas was widespread in both rivers, <br />but was abundant only in occasional seine samples from backwaters. Notropis <br />stramineus and Richardsonius balteatus were common in the Green River, but <br />were uncommon-to-rare in the Yampa. <br />Occurrence of fishes found in the present study was generally similar <br />to that reported by Holden and Stalnaker (1975a, 1975b), Seethaler et al. (1979), <br />and Tyus et al. (1981a). Gila elegans was reported abundant in the Green River <br />at Echo Park in 1964-66 (Vanicek et al. 1970), but Holden and Stalnaker (1975b) <br />found the species to be rare. No G. elegans were found in 1981, and the <br />species appears to be extirpated in DNM. G. cypha were rare in 1981, as <br />was reported by Holden and Stalnaker (1975b) from 1968-71. The five G. cypha <br />collected in 1981 were found in deep pools or eddies adjacent to boulders <br />where water velocity was < 0.5 ft/sec. Xyrauchen texanus was found in spawning <br />condition in May 1981 from the identical riffle where found by McAda i:n 1975 <br />(McAda and Wydoski 1980). Ptychocheilus lucius was rare; however, a radio- <br />telemetry study (Tyus et al. 1981b) discovered spawning Colorado squawfish in <br />the lower 32 km of Yampa canyon in early July 1981 at which time the species <br />was locally common. <br />Results of the Yampa River Study are preliminary since data analysis <br />has just begun. The final report is due in January 1982 and will include <br />information for all fish species, with emphasis on endangered fishes. Infor- <br />mation from radiotelemetry and larval collections will be used to explore <br />spawning of Colorado squawfish. The largest task has yet to be addressed: <br />combining all FWS studies so that the upper Colorado River Basin can be placed <br />in perspective regarding the most important habitats for endangered fishes. <br />When this is done it appears the Yampa River may be proven a critical link.
The URL can be used to link to this page
Your browser does not support the video tag.