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5 <br />Because of the difficult logistics of this pilot study, data <br />collection did not follow most creel survey statistical analysis <br />guidelines. Unfortunately this oversight invalidates most <br />methods of expanding survey data to estimate fishing pressure. <br />Creel survey statistical analyses generally require more than one <br />instantaneous count per day, and count times must be randomly <br />selected to cover all possible hours of angling activity. In <br />this study, count times were neither random nor instantaneous. <br />Therefore, the information is generally presented in <br />unexpanded form. An estimate of the total number of anglers <br />present in one month, by stratum, was obtained by multiplying the <br />average number of anglers/day by the number of days in a stratum. <br />However, note that this rough estimate is based on only one count <br />per day. Because counts do not equal interviews, the interview <br />numbers are used to present the average length of a fishing trip, <br />but the counts were used to estimate pressure in anglers per day, <br />because anglers may have been interviewed more than once per day. <br />Results <br />Fishing Aressure <br />The estimated monthly total weekend fishing pressure on the <br />Colorado River declined from the maximum of 106 anglers in Ap/May <br />to 60 anglers in October (Figure 2). Total weekend pressure was <br />greater than weekday pressure each month, despite fewer total <br />days. Estimated weekday pressure varied from 98 to 38 anglers <br />per month with an overall decline from April to October. The <br />monthly average of anglers per day varied from 1.8 to 4 on <br />