My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8165
CWCB
>
UCREFRP
>
Public
>
8165
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:33 PM
Creation date
6/1/2009 11:59:55 AM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8165
Author
Czapla, T. E.
Title
Genetics Management Plan (Revised).
USFW Year
1999.
USFW - Doc Type
Denver, Colorado.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
55
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
1 <br />1 <br />1 <br /> <br />1 <br />[1 <br /> <br />t <br /> <br />1 <br />t <br />t <br />i <br />t <br />1 <br /> <br /> <br /> <br />VII. SPECIFIC RECOMMENDED GENETIC MANAGEMENT ACTIONS FOR ENDANGERED <br />FISH STOCKS IN THE UPPER COLORADO RIVER BASIN <br />Razorback Sucker <br />Middle Green River <br />Continue development of a broodstock of the Middle Green/ Yampa River (Razorback-Jensen Baz) <br />stock at Ouray National Fish Hatchery. This stock contains sufficient fish to apply the recommended <br />breeding strategy of 25 paired coatings (i.e., 50 fish). In 1998 two more family lots were developed <br />to give a total of 10 family lots. Over the past two years, post-spawned adults collected in the river, <br />held a yeaz and then induced to spawn, have failed to produce useful broodstock lots. An urgency <br />has developed on two fronts in developing the broodstock: one, recognition by fishery biologists that <br />the population is readily declining; and two, with the developed broodstock annual augmentation <br />stocking numbers has not been met. A concerted effort should be made in spring 1999 to collect, <br />hold and spawn as many razorback suckers stream side as possible to complete the 25x25 paired <br />rnatings (i.e., 15 males x 15 females for 15 family lots). The progeny will be developed at Ouray <br />NFH and Wahweap, Utah State Hatchery. In addition, 5x5 diallele crosses should be made to allow <br />for the production of stocking plans. Consideration should be given to introducing razorback suckers <br />from the Lake Mohave stock to enhance the genetic diversity of the Green River population. <br />Develop a broader stocking plan for the Green River. Modify stocking plan of 1000 razorback <br />sucker to a greater number in the fall of the year using equal family lot scenarios, but also deternne <br />the success and appropriate sizes to stock. In 1995 an augmentation plan was implemented; 931 <br />razorback sucker 100-127 mm (4-5 inches) in total length were stocked. No fish from this stocking <br />has been collected to date and its assumed that the size of the fish was too small to escape predation <br />and survival appears to be extremely low. h1 1996, 10681azger razorback sucker 209-308 mm (8-12 <br />inches) in total length were stocked at Split Mountain, at least 7 of these fish were collected in ISMP <br />monitoring efforts during the spring and summer 1997 (Tom Chart, per. comm.). Continue to <br />implement the basinwide razorback monitoring program in the middle Green River to detemune the <br />population status and trends and evaluate stocking efforts. <br />Lower Green River <br />1. This stock has gained recognition based on the recent collections of larvae and adults in the lower <br />Green River. Little infommation is available regarding movements. A question remains as to how <br />they are related to razorback suckers from above in the middle Green River and previously collected <br />fish in the Colorado Arm of Lake Powell. Allozyme and/or mtDNA testing should be done to <br />determine the relatedness to razorback suckers from upstream and downstream of this river reach. <br />2. Continue to monitor and observe the population through basinwide razorback monitoring. <br />Determine movements among river reach populations and Lake Powell. <br />3. Determine population size estimate and its relation to interim management objectives for razorback <br />sucker. <br />Upper Colorado River <br />A refuge broodstock of this razorback sucker stock is being developed and augmentation stocking <br />has been implemented in the Gunnison River from the Redlands Irrigation Diversion upstream to <br />Delta, Colorado as well as future restoration stocking in the reach of historic habitat between <br />Palisades and Rifle, Colorado (LJS Fish and Wildlife Service 1995). <br />Implement refugia and broodstock development. <br />Continue stocking in the Gunnison River, as production is increased and appropriate numbers <br />become available, expand the stocking effort to include the Colorado River reach from Palisade to <br />Rifle, CO when production goals have been met for the Gunnison River. A total 318 [83-110 mm <br />(3-4 inches) total length] in 1995 and 282 [280-406 mm (11-16 inches) total length] in 1996 <br />razorback sucker were stocked in the Gunnison River near Delta. In 1997, approximately 3,732 were <br />stocked. In 1998, 608 were stocked. <br />17 <br />
The URL can be used to link to this page
Your browser does not support the video tag.