7615

• UCREFRP Catalog Number: 7615
• Author: McAda, C. W.
• Title: Evaluation of the Interagency Standardized Monitoring Program.
• USFW Year: 1989.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

I.
l chub collected, rather than changes in CPUE of humpback chub alone are
the primary monitoring tool of the humpback chub portion of the ISMP.
the per of the ISMP to detect a significant change in CPUE from one year to
I&- men was estimated using the formula:
d= axya
Q
Where, a = percent change to be detected,
U = mean CPUE for year 0,
o = standard deviation for year 0, and
d = used to determine the power from a table of the t distribution.
Vr power of the ISNP to detect a significant change in CPUE (either late-
juvenile/adult or post-larval) over a five-year period was estimated using the
ft[tng formulas:
b a x U-----
5
a x
,r(nx16xi-x) 2
d - b x 1
Where, a = percent change to be detected,
b = the slope of the line between CPUE at year 0 and at year 5,
p = the mean CPUE for year 0,
ob = the standard deviation of the slope of the above line,
o = standard deviation in year 0, used to estimate standard
deviation over the 5 years (assumed to be constant),
n = sample size for year 0, assumed to be constant over the 5 years,
and
34x2 xx)2 = estimate of variation over the range of years, constant of
17.5 for 5 years, and
d = probability of accepting HQ, determined from a table of the non-
central F distribution.
5