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Table 8. Total number collected, % composition, and mean catch-per- _- unit-effort (CPUE), of electrofishing collections in the San Juan River - San Juan Arm of Lake Powell transitionzone, RMI ~ 16-5. Spring collections were made March 18 - April 12, 1987, total effort = 14.51 hrs. Summer collections were made July 7-12, 1987, total effort = 15.23 hrs.a Total No. Mean CPUE ~ Species Collected % (fishJmile) St. Dev. Spring carp 23 33 1.4 3.0 red shiner 8 11 0.7 2.0 flannelmouth sucker 6 9 0.2 0.3 ~ channel catfish 33 47 2.1 4.4 Summer threadfin shad 9 1 0.3 0.6 carp 235 33 9.9 7.8 red shiner 11 11 0.4 0.6 ~ fathead minnow 1 * 0.1 0.2 flannelmouth sucker 31 4 1.3 1.2 _ channel catfish 471 59 20.7 9.6 striped bass 9 1 0.4 0.5 green sunfish 1 * 0.04 0.1 _ bluegill 4 * 0.2 0.4 ~ walleye 2 * 0.1 0.2 aElectrofishing catch for summer is presented in units of fish per hour in Appendix B. Five backwaters were seined during UDWR's spring electrofishing. One backwater produced a single specimen of Gila sp. (Table 9). This backwater was located at RMI 103, at the confluence of Desert Creek. The remaining seining effort of UDWR was expended during the standardized fall seining; a total of 38 sites were seined in RMI 136-16 (Table 9). Not all habitats seined met the strict definition for a backwater, as presented earlier. Two were actually small side channels with low velocities and were located in the lower canyon area of the river. Thirteen sites were seined by BOR during fall standardized seining in RMI 16-0. The standardized fall seining by ~ UDWR and BOR produced a total of fifteen YOY Colorado squawfish, _ ranging in size from 26 to 34 mmTL, and one Gila sp. (Table 9). The six Colorado squawfish and one Gila sp. collected by UDWR were all taken in a relatively short segment of the river -- between RMI 102 _ and RMI 93 (Table 9). The Colorado squawfish collected by BOR were . taken between RMI 14 and 6 (Table 9). - 25 -