WSPP336

• File Number: 8240.200.10.H
• Description: Colorado River Threatened-Endangered - UCRBRIP - Program Organization-Mission - Stocking
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 2/4/1998
• Author: DOI-FWS
• Title: Management-Control of Non-Native Fish Species in Floodplain Ponds Along the Upper Colorado and Gunnison Rivers - Final Environmental Assessment-Finding of No Significant Impact - 02-04-98
• Water Supply Pro - Doc Type: Report/Study

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TABLE OF CONTENTS

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Li st of Fi gures

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List of Tables.

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I.

PURPOSE AND NEED

1
1
1
2
4

A. Genera 1

B. Purpose

C. Need. .

D. Background Information

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

ALTERNATIVES CONSIDERED

7

A. Alternative 1 - No Action 7

B. Alternative 2 - Mechanical or Chemical
Control of Nonnative Fish Species From Ponds
in the Floodplain . . . . . . . . . . . .. 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