My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
6003
CWCB
>
UCREFRP
>
Public
>
6003
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:28 PM
Creation date
5/20/2009 9:32:04 AM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
6003
Author
Kaeding, L. R. and D. B. Osmundson.
Title
Studies of Endangered Colorado River Fishes
USFW Year
1987.
USFW - Doc Type
Conservation Measures For The Green Mountain and Ruedi Reservoir Water Sales - Annual Progress Report.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
35
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
effectively. Without combining the two subsamples, mean total length of fish <br />collected with the large seine was 48.7 mm, whereas mean length of beach- <br />seined fish was 37.0 mm. Subsequent samples collected with only the large <br />seine indicated no increase in mean or maximum length. <br />Young-of-the-year (YOY) carp were too large this late in the season to be <br />prey for the squawfish, and YOY fathead minnows were scarce. Insect life <br />that might be used as food by squawfish also appeared to be scarce. <br />Densities of zooplankton were not determined. Mean condition (K) decreased <br />during this period (Table 6), suggesting that squawfish were not feeding <br />adequately. Entering winter in poor condition may affect survival rates of <br />Colorado squawfish in ponds, and perhaps also in the river. <br />In West Pond, a large number (perhaps the majority) of the stocked <br />squawfish schooled in a shallow bay (2-13 cm deep) for the first month <br />following stocking, then they disappeared, presumably dispersing into deeper <br />water. This contrasts with the behavior of fish released in Fish Chalet <br />Pond, where the fish dispersed immediately after stocking. While the school <br />was in shallow water of West Pond, we used a 3 x 6-mm-mesh beach seine to <br />collect fish samples. Significant growth had occurred during the first <br />month following stocking (Table 6). After this, we were unable to collect <br />" adequate samples of fish because the shoreline precluded effective seining. <br />However, we were able to collect a few individuals in minnow traps. One was <br />80 mm long and had grown at least 19 mm since stocking. Although the <br />inadequate sample sizes prevented meaningful conclusions about the body <br />condition of these fish, the few individuals that were collected exhibited a <br />higher K value during October and November than the mean value for fish at <br />Fish Chalet Pond during this time. Availability of YOY fathead minnows in <br />23
The URL can be used to link to this page
Your browser does not support the video tag.