My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
7048
CWCB
>
UCREFRP
>
Public
>
7048
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 10:36:29 AM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7048
Author
Desert Fishes Council (Edwin Pister, e.
Title
Proceedings of the Desert Fishes Council
USFW Year
1991.
USFW - Doc Type
Volumes XX and XXI
Copyright Material
NO
Jump to thumbnail
< previous set
next set >
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
252
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
peritoneum and internal organs of the recipient fish. Pulse and frequency were <br />rechecked prior to and immediately following implantation to record any <br />variation in frequency or pulse from factory specifications, and to minimize <br />the difficulty in locating transmitter signals during tracking. <br />Smith-Root search (SR-40) and standard tracking (RF-40) receivers, as well <br />as an Advanced Telemetry Systems (ATS) programable scanning receiver were used <br />for tracking and monitoring. These were equipped with Larsen Kulrod MO-40 <br />whip omnidirectional antennas or Smith-Root loop directional antennas. <br />Surgical Implant Procedures <br />The radiotransmitters were implanted surgically according to the <br />techniques described by Tyus (1982, 1988). Fish were anesthetized with <br />tricaine methanosulfate (MS-222) in a 40-gallon plastic bucket used as a <br />portable live well. A fish was determined to be sufficiently anesthetized <br />when, within 1-2 minutes, it could no longer maintain equilibrium. <br />Surgery was performed by placing the fish on a measuring board or a <br />specially designed cradle placed atop the live well. One person held the fish <br />firmly in position while another continuously bathed the gills with water using <br />a baster. Water with anesthesia was used to a point about midway through the <br />surgery at which time fresh water was used to minimize the effect of the <br />anesthesia and to speed recovery of the fish. Fish exposed the least amount of <br />time to the anesthesia recovered quicker and were more alert for an earlier <br />release. <br />To implant the transmitter, a small incision (2.5 - 3.0 cm long) was made <br />anterior and slightly dorsal to the insertion of the left pelvic fin. The <br />transmitter was inserted toward the posterior end of the abdominal cavity so it <br />came to rest on the pelvic girdle. The incision was closed with four to eight <br />sutures using 3-0 EthilonTM black monofilament nylon with an FS-1 cutting <br />needle. Each fish was then observed in a live well or recovery pen in the <br />river for periods of up to 1 hour, until it was alert and actively swimming, <br />before release. <br />All adult Colorado squawfish and razorback suckers were weighed, measured, <br />and tagged with a uniquely-numbered orange Carlin dangler tag attached to the <br />base of the dorsal fin (Valdez et al. 1980). Previously tagged fish were <br />recorded as recaptures and the tag replaced only if the original attachment <br />thread appeared frayed. Only Colorado squawfish 530 mm total length (TL) or <br />larger were equipped with radiotransmitters, although some slightly smaller <br />fish were used that were judged sufficiently robust to accept a transmitter. <br />Mo size restriction was placed on adult razorback suckers. <br />Radiotracking <br />Six 10-day tracking trips were conducted during each of the 2 years of <br />this investigation. The fish were located on the first day of each trip by <br />aerial tracking with fixed-wing aircraft. The location of each fish was <br />provided to ground crews to facilitate locating the fish for subsequent <br />monitoring and habitat analyses. Aerial tracking was conducted from a Cessna <br />182 RG fixed-wing aircraft owned by BIO/WEST. The same pilot and observer <br />conducted most of the tracking using uniform procedures to maximize the number <br />31
The URL can be used to link to this page
Your browser does not support the video tag.