8002

• UCREFRP Catalog Number: 8002
• Author: Bozek, M. A., L. J. Paulson and J. E. Deacon.
• Title: Factors Affecting Reproductive Success of Bontytail Chubs and Razorback Suckers in Lake Mohave.
• USFW Year: 1984.
• USFW - Doc Type: Technical Report No. 12,
• Copyright Material: NO

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TABLE OF CONTENTS
Page
LIST OF FIGURES iii
LIST OF TABLES v
ACKNOWLEDGEMENTS vi
1'.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Status of the Razorback Suckers and Bonytail Chubs
in the Colorado River . . . . . . . . . . . . . . . . . . . 1
1.2 History of the Lake Mohave Area . . . . . . . . . . . . . . . 3
2.0 DESCRIPTION OF THE STUDY AREA . . . . . . . . . . . . . . . . . . . 5
3.0 METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Cove Surveys . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Sampling Locations . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Trammel Netting . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.5 Larval Collections . . . . . . . . . . . . . . . . . . . . . . 11
3.6 Temperature Development Analyses . . . . . . . . . . . . . . . 12
3.7 Physical Hydrodynamics . . . . . . . . . . . . . . . . . . . . 13
3.8 Statistical Analyses . . . . . . . . . . . . . . . . . . . . . 13
4.0 RESULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Cove Surveys . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Catch Rates . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Length and Weight Distributions, Condition Factors,
Sex Ratios, and Disease . . . . . . . . . . . . . . . . . . 23
4.4 Spawning . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.41 Spawning Habitat . . . . . . . . . . . . . . . . . . . 43
4.42 Spawning Duration and Relationship to Physical
Factors . . . . . . . . . . . . . . . . . . . . . . 45