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Monitoring - Elective reaches, near standard rSMP reaches, will be sampled each year using ISMp protocols. Four reaches will be identified and sampled on a rotating 3-4 year schedule. Population estimate - In 1998, we will begin a three year effort to obtain a population estimate for the adult Colorado squawfish population in the Middle and Lower Green River. I~ 1998, existing data and possible techniques will be examined to determine the best approach to obtain population estimates in the Middle and Lower Green River. This may involve coordinating activities with USFWS population estimates on the Colorado River to explore feasibility of using their techniques for estimating populations. See ISMP handbook to be revised for more detailed methods. In the future, sampling to obtain population estimates could be coordinated to overlap with other sampling intensive studies (e.g., 1997 and 1998 efforts with monitoring for razorback sucker and nonnative fish removal; both of these studies will be using trap nets which proved in 1996 to be very effective at capturing adult Colorado squawfish) which should increase our sample size. Humnback Chub Monitoring - Westwater Canyon, Desolation/Gray Canyon, and Cataract Canyon (RM's provided above) will be monitored during l sampling trip/year with methods similar to those used in Aspinall/westwater studies. These trips will occur in September (Westwater and Cataract) or July (Desolation). See the ISMP handbook for more detailed methods. Population estimate - In 1998, we will begin a three year effort to obtain a population estimate for adult humpback chub population in Westwater Canyon. This effort will consist of a trip/month from July to October (4 trips) to PIT-tag adult humpback chub (>l75mm). Methods will similar to those described above, except techniques will be geared toward that capture of adult fish, instead of all life stages. We chose Westwater Canyon for the first attempt at obtaining a "good" population estimate in the Upper Basin for humpback chub because of the number of fish present in the Canyon, the number of fish already marked, and the knowledge that UDWR biologists have with this canyon. See the ISMP handbook (to be revised) for more detailed methods. VII. Task Description and Schedule (FY-l998): Task l - Baseline ISMP efforts (current sampling protocols) . Field work will be conducted using current ISMP handbook guidelines on monitoring young-of-year, late juvenile and adult Colorado squawfish on the Colorado, Green and White rivers. Field work will be conducted in spring (April- May) and fall (September-October). Preserved YOY fishes will be identified, catalogued and stored at the Larval Fish Lab in Ft. Collins, Colorado. Data will be entered on the computer and transferred 3