9720

• UCREFRP Catalog Number: 9720
• Author: U.S. Fish and Wildlife Service.
• Title: Razorback sucker ‎(Xyrauchen texanus)‎ genetics management and captive propagation plan, Dexter National Fish Hatchery and Technology Center.
• USFW Year: 2004.
• USFW - Doc Type: Dexter National Fish Hatchery and Technology Center
• Copyright Material: NO

Table of Contents:
Introduction 1
Geography of Razorback Sucker Distribution 4
Upper Colorado River Basin Recovery Unit 4
Green River/Yampa River System 4
Upper Colorado Mainstem/Gunnison River System 5
Representative Broodstocks 6
San Juan River System 7
Lower Colorado River Basin Recovery Unit 8
Lake Mohave 10
Undesignated Tributary Systems 11
Dexter NFHTC Lake Mohave Representative Broodstock 13
Relationship to Recovery Plan and Goals 15
Immediate Management Actions Needed 16
Broodstock Management Objectives 18
Genetic Considerations in RBS Broodstock Management
and Captive Propagation Program 19
Maintenance of current levels of genetic variation 19
Maintenance of genetic refugia as a captive broodstock , 20
Methods used to monitor gene pool maintenance 23
Genetic Risks for Broodstock Management and
Captive Propagation 24
Founder effect 24
Loss of adaptive variation by random genetic drift 25
Inbreeding and inbreeding depression 25
Outbreeding and outbreeding depression 26
Domestication/artificial selection in hatchery population 26
Strategies to Minimize Risks 27
Genetic Research Needs 30
Genetic Broodstock Management Objectives 31
Captive Propagation Objectives 34
Literature Cited 40
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