7152

• UCREFRP Catalog Number: 7152
• Author: Holden, P. B.
• Title: Relationship between Flows in the Yampa River and Success of Rare Fish Populations in the Green River System.
• USFW Year: 1980.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

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Table 1. Numbers of Colorado squawfish caught by BID/WEST in 1977,
1978, and 1979 by year class in the Green River between
Jensen and Ouray, Utah.

']

Year of Sampling Year classes
capture effort 1975 1976 1977 1978 1979
t
1977 High 14 8 0 'i
'I
1978 Low 6 0 17 ~
,
1979 Very High 1 255 1131
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Total 14 14 1 272 1131 ~
Reprortuctive Success Good Good Poor Good Good

and Ouray in August which included 106 seine hauls. Effort in 1978
included samples in April, June, July, August, and October of only

about 2 miles of river near Jensen, including 28 seine hauls. Effort

in 1979 included monthly samples from April through September of about
20 miles of the river reach in question, as well as 4 monthly samples
in the 2-mile section at Jensen with 163 total seine hauls. Therefore,

effort was high in 1977 and 1979, but relatively low in 1978.

The data presented in Table 1 indicates that success was good

in 1975, 1976, 1978, and 1979. Success in 1977 was poor, and in fact

was nearly non-existent in the Jensen-Ouray area. The only fish that
may have been from the 1977 year class was a 5-inchspecimen collected
in May of 1979. Collections in 1977 were conducted during August