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Last modified
7/14/2009 5:02:32 PM
Creation date
5/18/2009 12:27:24 AM
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UCREFRP
UCREFRP Catalog Number
8064
Author
McAda, C. W., et al.
Title
Interagency Standardized Monitoring Program
USFW Year
1997.
USFW - Doc Type
Summary of Results, 1996 - Annual Report.
Copyright Material
NO
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identifiable, but that could not be netted, were also counted. All captured rare fish were <br />measured (total length [mm]), weighed (g), and tagged internally with uniquely-numbered <br />PIT tags (Burdick and Hamman 1993) before release. Beginning in 1994, investigators <br />captured all fish possible from short subreaches within the ISMP reaches. All fish captured <br />in these subreaches were identified and enumerated before release. Data from these <br />additional samples will be described in a later report. <br />Capture data were analyzed as number of Colorado squawfish collected per hour of <br />electrofishing effort (CPE). CPE calculations were done using two methods-1. (Colorado <br />squawfish collected /sampling time) and 2. ([Colorado squawfish collected + Colorado <br />squawfish observed] /sampling time). One sample consisted of the electrofishing done along <br />one shoreline of one subreach, with at least two samples (range, 2-8) taken in each <br />monitoring reach. CPE was calculated for all subreaches and then mean CPE was calculated <br />for each monitoring reach and for each river. <br />CPE was not calculated for fishes other than Colorado squawfish. However, total <br />numbers of the species mentioned above were tallied for each sampling reach. Simple <br />comparisons of total numbers captured or observed while shocking were made in reaches or <br />rivers where most of these species occurred. <br />Size distributions of all Colorado squawfish collected were summarized by river. Mean <br />and median lengths and other summary statistics were calculated for the 13 reaches and four <br />rivers sampled. <br />Results and Discussion <br />Distribution and Abundance <br />River-wide catch rates increased, at least slightly, in all four rivers sampled (Figures 9, <br />10, 11, 12; Table B-1). The increase was greatest in the Green and Yampa rivers. <br />Riverwide catch rates in all four rivers have been consistently higher during recent years than <br />they were during early portions of ISMP. The consistently high catch rates support the <br />hypothesis that one or more strong year classes from the mid 1980's have increased the <br />basin-wide Colorado squawfish population. This increase has been most noticeable in the <br />15 <br />
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