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I I I I I I I I I I I I I I I I I I I Table 1. Purpose and dates of sample trips for the Cataract Canyon Studies, 1985-1988. PRIMARY PURPOSE YEAR 1985 1988 1986 1987 YOY/Osa MAR 21-25 HB/SSb APR 13-17 APR 11-16 CS+HB/SSC JUL 10-15 JUL 11-17 JUN 23-29 JUN 21-27 CS+HB/SS CS+HB/SS CS+HBIYO'fd CS+HBIYOY HB/SS CS+HBIYOY CS/MONe HB/SS CS+HBIYOY JUL 24-29 JUL 23-29 JUL 8-14 JUL 12-18 AUG 7-11 AUG 12-18 JUL 28-AUG 3 AUG 2-8 AUG 24-29 AUG 26-SEP 1 AUG 17-23 AUG 24-30 SEP 8-12 SEP 21-26 SEP 15-22 SEP 19-25 SEP 15-21 SEP 26-30 OCT 8-13 SEP 30-0CT 6 OCT 6-12 OCT 6-12 a YOY/OS = assess overwinter survival of YOY Colorado squawfish above the confluence. b HB/SS = locate concentrations of chubs and determine if reproduction is occurring. c CS+HB/SS = locate spawning sites of Colorado squawfish and humpback chub by e/ectrofishing, gill netting, and larval drift nets through the entire study area. d CS+HBIYOY = sample for YOY, juvenile and adult Colorado squawfish and humpback chub through the entire study area. e CS/MON = assist UDWR in ISMP for YOY Colorado squawfish from Mineral Bottom and Potash to the confluence. Four motorized hypalon rafts were used, including one 18-foot Riken Havasu, one 17-foot Riken Havasu, one 17-foot Achilles sportboat, and a 23-foot J-rig from Tag-A-Long Tours (Photos A-33 through A-40). The Havasus were powered by XD-25 hp Mercury outboards, and were used for fish sampling craft as described later in this report. The 23-foot J-rig was powered by twin 20 hp Mercury outboards, and was used as a support craft. The Achilles was powered by a 40 hp Yamaha outboard. This craft was first used in 1987 to decrease travel time to and from the principal study area, to provide greater mobility in swift whitewater sections, to expand sample areas, and to provide the capability for quickly transporting endangered fish live from the area, in concurrence with the 'Bonytail Protocol' (USFWS 1987). These four rafts were used on all canyon trips. Craft used on confluence trips included 16 and 14-foot aluminum Jon bOats powered by 25 or 35 hp Mercury outboards, as well as the previously described Achilles. Sampling was conducted where possible. Within Cataract Canyon, sampling often had to be confined to the less turbulent water between rapids. Since the motorized rafts were unable to ascend 17