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

.
f '

(.
'ft
f

Page

EXPERT OPINION QUESTIONNAIRE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20

Question 1: What rivers have you had experience with, or are
responsible for management within? ..................... 20

Question 2: Are impacts from introduced species a problem in these waters? 20

Question 3: Which introduced species are presenting a problem? ......... 22

Question 4: What native fishes are affected and how? ................. 22

Predation .............................................. 24

CompetItIOn ............................................ 25

Hybridization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26

Disease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 27

Habitat alteration ........................................ 27

Question 5: Is there documented evidence demonstrating
predation, competition, or a beneficial effect? .............. 27

Question 6: For problematic introduced fishes, what is
your evaluation of their abundance and impact? ............ 28

Question 7: Do any of the introduced fishes support -sport

fisheries? ......................................... 29

Question 8: Is angling mortality affecting endangered fishes? ............ 31

Question 9: Are field techniques available to reduce
impacts from introduced fishes? . . . . . . . . . . . . . . . . . . . . . . . .. 32

Sport fishery regulation .................................... 33

Sportfish stocking ........................................ 34

Eradication ........................................ . . . .. 34

Habitat management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35

n

t