8215

• UCREFRP Catalog Number: 8215
• Author: U.S. Fish and Wildlife Service.
• Title: Final Environmental Assessment
• USFW Year: 1997.
• USFW - Doc Type: Management and Control of Noonative Fish Species in Floodplain Ponds of the Upper Colorado and Gunnison Rivers.
• Copyright Material: NO

TABLE OF CONTENTS
To is pa4e
List of Figures iv
List of Tables v
I. PURPOSE AND NEED 1
A. General 1
B. Purpose 1
C. Need 2 -__
D. Background Information ,4
1. Recovery Program 4
2. Recovery Issue Discussed in this Draft
Environmental Assessment 5
(A) Introduction of Nonnative Fishes into
the Upper Colorado River Basin 5
(B) Impacts of Nonnative Fish Introductions
on Native Fishes 5
(1) Impacts of Predation on Native
Fish Fauna 6
(2) Impacts of Competition on Native
Fish Fauna 6
II. ALTE RNATIVES CONSIDERED 7
A. Alternative 1 - No Action 7
B. Alternative 2 - Mechanical or Chemical
Control of Nonnative Fish Species From Ponds
i n the Fl oodpl ai n 7
C. Alternative 3 - Install Mechanical Devices in
Outlets of Ponds of the Floodplain to Prevent
Chronic Escapement of Nonnative Fish Species 7
D. Alternative 4 - Slope the Bottom of Ponds in
the Floodplain and Reconnect the Ponds with
the Rivers 7
i