9502

• UCREFRP Catalog Number: 9502
• Author: Osmundson, D.
• Title: Population Dynamics of Colorado Pikeminnow in the Upper Colorado River.
• USFW Year: 2002.
• USFW - Doc Type: Grand Junction.
• Copyright Material: NO

TABLE OF CONTENTS
LIST OF TABLES .....................................................iii
LIST OF FIGURES .....................................................iv
ACKNOWLEDGMENTS ................................................ vi
EXECUTIVE SUMMARY .............................................. vii
INTRODUCTION ...................................................... 1
STUDY AREA ......................................................... 2
METHODS ........................................................... 2
Capture Efforts ................................................... 2
Total Abundance Estimation ......................................... 4
Adult Abundance Estimation ......................................... 5
Rationale for using a length-based criterion ......................... 6
Rationale for using 500 mm as a minimum-length criterion ............. 6
Catch Rate ....................................................... 7
Dispersal ........................................................ 8
Sex ratio ........................................................ 8
Growth Rate ..................................................... 9
All fish ....................................... 9
Gender-specific ............................................ 10
Body Condition .................................................. 11
Length Frequency ................................................ 12
Predicting Change in Adult Numbers .................................. 12
Statistical Analysis ................................................ 13
RESULTS AND DISCUSSION .......................................... 14
Estimates of Total Population Size .................................... 14
Estimates of Adult Population Size ................................... 17
Catch Rates ..................................................... 19
Catch Rates of Sympatric Species
Dispersal ....................................................... 27
Sex Ratio ....................................................... 29
Growth Rate .................................................... 31
All fish ................................................... 31
Gender-Specific ............................................ 34
Body Condition .................................................. 38
i