9413

• UCREFRP Catalog Number: 9413
• Author: Osmundson, D. B.
• Title: Flow Regimes for Restoration and Maintenance of Sufficient Habitat to Recover Endangered Razorback Sucker and Colorado Pikeminnow in the Upper Colorado River.
• USFW Year: 2001.
• USFW - Doc Type: Grand Junction.
• Copyright Material: NO

TABLE OF CONTENTS
LIST OF TABLES ..................................................... iii
LIST OF FIGURES ........:............................................ iv
ACKNOWLEDGMENTS ................................................. v
EXECUTIVE SUMMARY ............................................... vi
INTRODUCTION .......................................................1
Background .......................................................2
General Approach ..................................................5
RAZORBACK SUCKER ........................... ...................... 7
Adult Habitat Use ............................ ...................... 7
Winter ............................... ......................7
Spring ............................... ......................8
Summer ............................. ......................8
Other Life History Attributes .................... ...................... 8
Reproduction ......................... ......................8
Growth .............................. .....................11
COLORADO PIKEMINNOW ............................................ 12
Adult Habitat Use ................................................. 12
Winter ...................................................12
Spring ....................................................12
Summer ..................................................14
Transitional periods .........................................14
Other Life History Attributes ......................................... 15
Distribution ...............................................15
Reproduction ...............................................15
Diet, growth, body condition and carrying capacity ................... 18
SEASONAL PARTITIONING OF THE YEAR .... ......................... 19
FLOW EFFECTS .... .... .............................................. 21
Habitat Heterogeneity and the Creation and Maintenance of Mesohabitats ....... 21
Creation and Maintenance of Nursery Habitat Backwaters ................... 24
Flooded Bottomlands For Razorback Suckers ............................ 26
Within-channel Productivity ..................:....................... 28
Colorado Pikeminnow Spawning Cues ................................. 29
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