My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
9444
CWCB
>
UCREFRP
>
Public
>
9444
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 4:44:46 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
9444
Author
Hawkins, J. A.
Title
X-ray Assessment of Electrofishing Injury of Colorado Pikeminnow.
USFW Year
2002.
USFW - Doc Type
Recovery Program Project 64,
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
36
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 />were easily distinguished in radiographs. Counts included number of vertebrae anterior <br />to abnormal vertebrae, number of abnormal vertebrae, and number of vertebrae <br />posterior to abnormal vertebrae. <br />Percent of compression of abnormal vertebrae was calculated by comparing <br />them to adjacent uninjured vertebrae. Average length of uninjured vertebrae was <br />obtained from two uncompressed, proximal vertebrae on each side anterior and <br />posterior to the abnormal vertebrae. <br />Capture histories of x-rayed fish were obtained from the Recovery Program <br />PIT-tag database to identify whether fish had multiple vertebral injuries from repeated <br />electrofishing captures and to examine growth of injured and uninjured fish that were <br />later recaptured. <br /> <br />RESULTS <br /> <br />Forty seven eolorado pikeminnow were caught by ISMP electrofishing from the <br />Colorado (n=21), White (n=13), and Yampa (n=13) rivers in May 1996. One of these <br />was a recaptured fish handled the day before. Total length averaged 554 mm (SD, <br />89.95) and ranged 355 to 774 mm (Figure 1). Length frequency was similar to that of <br />Colorado pikeminnow captured during ISMP in previous years (McAda et al. 1994a, <br />1994b, 1995, 1996). Conductivity ranged 175 to 400 ,uS/cm in the river and 350 to 480 <br />,uS/cm in flooded tributaries (Table 1). Secchi depth was 8 cm or less at several <br />locations. Electrofishing settings were pulsed-DC set at 30 or 60 Hz with output from <br />150-390 V and 4-15 amps. <br /> <br />8 <br />
The URL can be used to link to this page
Your browser does not support the video tag.