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. . . .' .. . . . . . . ~TIOOS 1. Continued monitoring of adult Colorado squawfisn and razorback suckers is recommended for winter 1987-88, to gather additional habitat information. 2. . The same 2-hour monitoring program with associated measurements is recommended for winter 1987-88. 3. The 24-hour monitoring program should be changed to a system of randomization by time of day or night, whereby the start time for monitoring a designated fish is selected at random. The monitoring period would be for 2-hours instead of 24-hours. The 24-hgyr monitoring is very labor-intensive, and the results indicate that, during the winter, a ~ fu2.y.r monitoring period represents fish u~e d2ring the remainder .E-f the ~. ~"ft ~o( 't'C..~<\..t.'f- ''''t.~jo..'''.l ~ ~t wodc. 1+ wt \00" ..:;:- ,^..1,..+..~ ,etf. Based on observed movements of fish with significant changes in water level, it is recommended that at least one flow experiment be conducted using Flamdng Gorge Dam to fluctuate wateir levels at a predetermined time when observers are with an aggregation of fish. The -purpose of this experiment is to establish minimum tolerable depths and velocities, as indicated !:?Y ~ chanqing posi tion ~ a deeper ~eqion of the river. - 4. 5. Establishment of staff gauges at key locations, such as Echo Park, Split Mountain, Ashley Creek, Bonanza Bridge, and Ouray is recommended to monitor water levels during monitoringpriods. ~:z.~ ':l-N,^" '1"'6",,-\0,.'): ~o( ""t.-...lr- (J"'''PHt.? 'TI'l. ~ <l.. r<4"O~. More time should be spent developing detailed maps of areas used by fish, possibly developin~ depth contours of areas consistently frequented. ~~O( tJ '-+ &lJo.~tm,. Continued use of Smith-Root SR-40 and RF-40 receivers and associated antennas is recommended for consistency through the study. 6. 7. 8. Continued use of Smith-Root radiotransmitters is recommended; the use of AVM radiotransmitters should be discontinued because: a. AVM transmitters are larger diameter and shape than Smith-Root transmitters, and require a larger incision in the fish. b. Greater variation in frequency and pulse rate were observed in the AVM transmitters than in Smith-Root modules. c. Reduced signal strength was noted in AVM transmitters that caused problems in locating fish by air and ground. 9. Considering that. the available radio frequencies range from 40.660 to 40.700 MHz, ~plan to order 20 radiotransmitters with the fOIIOWinj~OfAt frequencies: ~. 660, 1Q ~ 662, 40.664, 40.666, 40.668, 40.670, 40.672, ~." ~~.... 40.674, 40.676, 40.67'8l-~.680, 40.682, 40.684, 40.686, 40.688, 40.690, \f"t '" 40.692, 40.694, 40.69~ and 40.698. Pulse rates will be requested as 40, 60, 80 ppm for the adjacent frequencies. 34