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

it seems that these data can be used to make meaningful comparisons between the
monitoring program and previously collected data as long as the minor differences
in sampling technique are considered in the interpretation of the results.
Whenever young-of-the-year data from earlier years were available no other data
were considered for possible analysis. However, because post-larval sampling
was only initiated in the Colorado River in 1982, the other data files were
examined for earlier data that might be comparable. The standardized sampling
program in reach 1 (lower Colorado River) during 1979 and 1980 collected data
during the same time period as the monitoring program. The 1979 data appear to
be quite useful because the samples are distributed throughout the strata much
as they would be in the current monitoring program, the 1980 data are more
limited and are not as comparable.
The post-larval Colorado squawfish sampling appears to be quite useful for
predicting changes in numbers of small Colorado squawfish each fall because of
the close correlation between independent sampling efforts in reach 3 (upper
Green River) during 1984 and 1985. The Utah Division of Wildlife Resources and
the Fish and Wildlife Service independently sampled Reach 3 in both 1984 and 1985
with the resulting catch rates being very similar (Table 4; Appendix A, Figures
8,9). This suggests that the CPUE values are reasonably representative of the
actual number of small Colorado squawfish available each fall.
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