7625

• UCREFRP Catalog Number: 7625
• Author: Stone, R. C., L. Fields and K. Miller.
• Title: Lake Powell Post Impoundment Investigations.
• USFW Year: 1964.
• USFW - Doc Type: Progress Report No. 2,
• Copyright Material: NO

-12-

ho',;ever} is still insig:1ificant WhO:l cor::pared to t.he b<l3s and tr'Jut fis:-.e:-ie5.

reservoir. Harvest of the species and fishing pressure exerted for it alc:1e,

Channel catfish Here Com.'l1on 1:1 the Colorado River in the La.kc PO\o,"ell

vicinity before innundation. They constituted the major sport fis~, alt~ough

the remoteness of the river precluded all but a negligible ~ishery. Ge~erally,

these catfish were very slow growing and the vast majority were fro~ seven

to ten inches in length. Collections fror~ the Colorado before the reservoir

show a nine inch average length. Collections made by all gear duri:1g this

year show that the catfish has increased its averace size to about 279~m

(11 inches). The range in total length was lS4nu71 to 384mm (7 to 15 inche:;;).

The relatively high incidence of this species in ba~s stomachs vculd indicate

that it is receiving heavy pressure from the bass. Those individ~als found

in food studies have been the only small catfish observed.

A 90mm crappie was taken in a dynamite sample on December h, 1964 in

wa:n;eap Bay near the pla:1ting sites of the previous summer.

Other Species

Carp now appear to be the do~inant non-game fish species in the

reservoir. In collections this year they consti~uted ~ore than all other

non-game species taken combined. The green sunfish appeared to be the most

abundant :1on-game forage fish. A ranking of the various .'lon-game species

taken by all gear is as follows:

Percent of
Occ'.1rrcnce

Species

Carp
Green Sunfish
Flannelmou~h Sucker
Colorado Chub
Black Bullhead
Mountain Sucker

))
3J
8
3

2

1

It appears there has been a substantial reduction ~n populatio~s of

the forage minnO\{s since 1963. During 1963 these oninnows were very 2.b'.1.'lda::t