My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
9435
CWCB
>
UCREFRP
>
Public
>
9435
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:35 PM
Creation date
5/20/2009 5:13:07 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
9435
Author
Haines, B. and T. Modde.
Title
Humpback Chub Monitoring in Yampa Canyon, 1998-2000.
USFW Year
2002.
USFW - Doc Type
Project Number 22a4,
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
43
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 />catch per unit effort is too variable for detecting population trend. However, if the study area is <br /> <br /> <br />expanded to a larger geographical area (i.e., Whirlpool, Split Mountain and Lodore canyons) that <br /> <br /> <br />includes other adult populations, the resulting combined populations may result in increased <br /> <br /> <br />numbers of captures and recaptures and, furthermore, increase the probability of recapturing fish <br /> <br />marked in Yampa Canyon but that may have moved to these adjacent areas, thus making a <br /> <br />precise and unbiased population estimate more feasible. We recommend a three year three pass <br /> <br />electrofishing capture-recapture study in this expanded geographical area, combined with seining <br /> <br />to monitor reproductive success. <br /> <br />Conclusions <br /> <br />Using a three pass capture-recapture method, insufficient numbers of marked fish were <br /> <br />captured to produce a reasonable (bias < 10%, CV < 0.2) population estimate. Given that <br /> <br />humpback chub in Yampa Canyon have been documented (Miller and Modde, 1999) to travel <br /> <br />long distances relative to other humpback chub populations, we are unsure if the inability to <br /> <br />recapture sufficient numbers of humpback chub is due to their movement to habitats outside of <br /> <br />Yampa Canyon (e.g., Whirlpool, Lodore , and Split Mountain canyons), mortality of tagged fish, <br />or inefficiency of our capture methods. <br /> <br />Recommendations <br /> <br />1. Yampa Canyon represents marginal habitat for humpback chub during the base flow period, <br /> <br />16 <br />
The URL can be used to link to this page
Your browser does not support the video tag.