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

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FISHERIES STUDIES

H2IHOIS

Fish were collected by a variety of rne:.hods J none of i,'hich were

satisfactory. All '^'ere too ineffic ient to collect adequate s3.mples over

such a large reservoir with the fish populations present at this time

within the limits of man-hours available for the work. For ex~~le}

1}7l4 gill net hours returned 49 rainbow trout and 63 largemouth bass

for a catch per net hour of 0.03 and 0.04 fish, respectively. These net

sets a::'50 captured 142 rO'cll;h fish for a catch per :let hour of 0.09. Gill

nets ~ere 125' X 6' experimental floating and diving with poncls of 3/4}

1-1/4} 1-1/2} 1-3/4, and 2 inch bar measure. In addition, thro~ nets}

small seines, explosives, and stationary hoop nets were used. Hook and

line sa~pling provided the best tool, but this Has very time consu~ing

and perhaps biased.

The percentage of the 202 rainbow trout, 211 largemouth bass, B:ld

161 fish of other species sampled by various gear is given below:

GO",..
--'-..-

Percent
R3i::.bo'..' Tr:ut

Percent

Perce:lt
mho:' Specie::;

Larbe~outh Bass

Gill Net

23
55
16

31
44
5
15
5

96

t-':lg1 i ng
Creel Census
Explosives
T::.row-Net

4

Collections "ere made tl:.roughout the report period, but the maj0rity

of the samples were obtaj,:lcd from February, 1964 to about July, 1954. The

you"g-of-the-year bass 1.;ere obtained. fro:n AUGUst} 1954 to J3.nuary, 1:)55, as

were ~ considerable number of rainbow trout in the Wahweap area.

Total length ,,:as read to the neG.rest millimeter. 'weigh ts '.,;ere recorG,2d

to the nearest 10 grams. Scales and stomachs were removed immediately i~

the field.

Only those fish alive or in good condition at capture or taken by hook