My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8123
CWCB
>
UCREFRP
>
Public
>
8123
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 11:48:51 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8123
Author
Wydoski, R. S.
Title
Coordinated Hatchery Facility Plan
USFW Year
1994.
USFW - Doc Type
Need for Captive-Reared Endangered Fish and Propagation Facilities.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
149
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 />I. EXECUTIVE SUMMARY <br />Purpose of this Plan <br />This plan is intended to serve as a reference document to guide the <br />propagation of the four endangered Colorado River fishes in the Upper Colorado <br />River Basin. It includes pertinent information on genetics management as well <br />as guidelines for stocking and the disposition of captive-reared endangered <br />fishes. <br />Background <br />Four native fishes from the Upper Colorado River Basin are classified as <br />"endangered" under the Endangered Species Act of 1973 as amended. Biologists <br />in the upper basin generally agree that the lack of recruitment is the major <br />limiting factor in these long-lived endemic fishes. Recruitment of these <br />fishes is low because survival during the early life stages that are affected <br />by various changes in the water regime and available habitat, low productivity <br />of the riverine environment, and predation or competition from non-native <br />fishes that have been intentionally or accidently introduced into the upper <br />basin. Furthermore, the migratory routes of these fishes, particularly <br />razorback suckers and Colorado squawfish, have been impeded by the <br />construction of dams and irrigation diversion structures. <br />The Recovery Implementation Program (Program) philosophy and mission for <br />genetics management of endangered fishes is to maintain the genetic integrity <br />of wild and captive-reared fish in the Upper Colorado River Basin to prevent <br />irreversible losses of genetic diversity that may result from management <br />interventions or lack of action. The primary goal of the Program is to <br />conserve genetic variability of wild endangered fish stocks through recovery <br />efforts that will reestablish viable wild stocks by removing or significantly <br />reducing limiting factors that caused population declines. However, captive <br />propagation will be required for some stocks because of inadequate <br />recruitment. <br />Propagation and stocking of endangered fish was identified as one of the five <br />major Program elements for the Upper Colorado River Basin. However, this <br />element was difficult to address because of the uncertainty in stock <br />identification, lack of precise knowledge about status and trends of the <br />stocks, incomplete but important knowledge on the ecological requirements of <br />the fish based from ongoing studies, and the unknown response of the <br />endangered fishes to proposed habitat enhancement projects or to proposed <br />construction of fishways to allow migration into historic, but unoccupied <br />reaches of the Colorado and Gunnison rivers. <br />Uses of Captive-Reared Endangered Fish <br />Program needs have been identified for (1) genetic refugia and broodstock <br />development, (2) research and development, (3) information and education, and <br />(4) augmentation or restoration stocking. Refuges serve a vital function in <br />maintaining endangered fish that may become extinct due to declines in wild <br />populations or from catastrophic risks and to hold wild fish for broodstock <br />development. Captive-reared endangered fish are needed for research to <br />conduct laboratory and field experiments related to ecological requirements, <br />habitat use, interactions with nonnative fishes, response to contaminants in <br />a
The URL can be used to link to this page
Your browser does not support the video tag.