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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 7:39:26 PM
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UCREFRP
UCREFRP Catalog Number
7903
Author
Trammell, M. A., L. Lentsch and T. McKay.
Title
Assessment of Angler Impacts on Colorado Squawfish (
USFW Year
1996.
Copyright Material
NO
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2 <br />The survey concentrated on Colorado squawfish because the <br />other three endangered species Razorback sucker (Xyrauchen <br />texanus), humpback chub (Gila cypha), and bonytail (G. elegans) <br />either do not occur in these areas or are too rare to likely <br />appear in a creel survey. This survey was a pilot study and was <br />intended to be improved and repeated the following year (1990), <br />but funding was not available. <br />Methods <br />The survey was conducted slightly differently on the Green <br />and Colorado Rivers. On both rivers the creel clerks attempted to <br />make instantaneous counts by counting anglers in some areas <br />before interviewing. However, instantaneous counts were not <br />possible due to limited access to the Green River area and the <br />extensive travel time required to cover the entire reach on both <br />rivers. In general, anglers were interviewed as they were <br />counted. The count times on the Green River were alternately at <br />0700 or 1400 hours. Count times were randomly selected on the <br />Colorado River. Only one count per day was made on each river. <br />For both rivers, each month wa,s divided into two strata, weekends <br />and weekdays. Weekend days were sampled proportionally more often <br />than weekdays (Table 1). In the analyses, the last week of April <br />was combined with the month of May. <br />On the Colorado River, the survey was conducted from mid- <br />April to mid-October. The study area (Figure 1) included river <br />kilometer (RK) 159.3 to 75.6 (river mile [RM] 99 to 47) (Sagers <br />Wash to Potash). The counts began at the upstream end of the <br />
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