7025

• UCREFRP Catalog Number: 7025
• Author: Hawkins, J. A. and T. P. Nesler.
• Title: Nonnative Fishes in the Upper Colorado River Basin
• USFW Year: 1991.
• USFW - Doc Type: An Issue Paper.
• Copyright Material: YES

TABLE OF CONTENTS

Page

LIST OF TABLES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. v

ACKNOWLEDGEMENTS ............................................ vi

PREFACE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

EXECUTIVE SUMMARY ........................................... vii

INTRODUCfION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. 1

METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

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General trends in abundance of nonnative fishes ....................... 7

Relationship between abiotic parameters and
abundance of nonnative fishes ..................................... 8

Interactions between native and nonnative fishes ...................... 10

T hi. t cti. 10
rop c In era ons.......................................

Predation ......................................... 10

Competition for food . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13

Forage supplementation .............................. 14

Spacial interactions ....................................... 15

Habitat alteractions by introduced fish . . . . . . . . . . . . . . . . . . . . . . . .. 16

Hybridization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16

Disease or parasite introductions ............................. 17

Incidental take by angling .................................. 17

Management recommendations ................................... 18