9585

• UCREFRP Catalog Number: 9585
• Author: U.S. Fish and Wildlife Service.
• Title: Inland Salmonid Broodstock Handbook.
• USFW Year: n.d.
• Copyright Material: NO

TABLE OF CONTENTS
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SECTION 1. GENETICS ....................................... 1-1
Causes of the Loss of Genetic Variation ............... 1-2
1. Genetic Drift ................................ 1-2
2. Inbreeding ................................... 1-2
3. Intentional Selection ........................ 1-2
4. Unintentional Selection ...................... 1-3
Methods to Minimize the Loss of Genetic Variation ..... 1-3
1. Collect Baseline Data ............~........... 1-3
2. Plan Management Practices .................... 1-4
3. Methods to Minimize the Loss of Variability
in Future Brood Populations ................ 1-4
A. Mating Ratio ............................ 1-4
B. Avoid Inbreeding ........................ 1-4
C. Number of Matings ....................... 1-4
D. Equal Contribution from Each Mating ..... 1-5
E. Relative Contribution from Each Take .... 1-5
F. Number of Spawning Takes ................ 1-7
G. Crossbreeding (outcrosses) .............. 1-7
H. Selection ......................... ..... 1-7
I. Mating Regimen .......................... 1-7
Effective Breeding Number ............................. 1-8
Rate of Loss of Genetic Variability ................... 1-9
Founding Broodstocks from Wild or Free Roaming
Populations ...................................... 1-9
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