3201

• UCREFRP Catalog Number: 3201
• Author: Osmundson, D. B.
• Title: Growth and Survival of Colorado Squawfish ‎(Ptychocheilus lucius)‎ Stocked in Riverside Ponds, With Reference To Largemouth Bass ‎(Micropterus salmoides)‎ Predation
• USFW Year: 1986
• USFW - Doc Type: \
• Copyright Material: NO

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TABLE OF CONTENTS
ACKNOWLEGEMENTS . . . . . . . . . . . . . . . . . . . . i i
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . vi
LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . xi
ABSTRACT . . . . . . . . . . . . . . . . . . . . . . . xi i i
1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . 1
Background and Literature . . . . . . . . . . . . 1
General . . . . . . . . . . . . . . . . . . . 1
Importance of Backwaters . . . . . . . . . . 3
Importance of Introduced Species . . . 4
Use of Gravel-Pit Ponds . . . . . . . . . . . 7
Objectives of the Study . . . . . . . . . . . . . 9
DESCRIPTION OF THE STUDY AREA . . . . . . . . . . . . . 13
METHODS AND MATERIALS . . . . . . . . . . . . . . . . 16
Field Studies . . . . . . . . . . . . . . . . . . 16
Selection of Study Ponds . . . . . . . . . . 16
Physical Limnology . . . . . . . . . . . . . 17
Fish Communities . . . . . . . . . . . . . . 18
Squawfish Stocking 19
Predation on Squawfish . . . . . . . . . . . 21
Predator Stomach Content
Collection . . . . . . 21
Stomach Content Composition . . . .
Size-Selective Predation . . . . . . . 21
. . 22
Squawfish Growth . . . . . . . . . . . . . . 25
Squawfish Survival . . . . . . . . . . . . . 26
Overall Survival . . . . . . . . . . . . 26
Size-Related Survival . . . . . . . 27
Laboratory Studies . . . . . . . . . . . . . . . . 30
General . . . . . . 30
Species-Selective Predation Experiments 32
Size-Selective Predation Experiment . . . . . 35

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