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<br />. ~ . ` ~'II <br />INTRODUCTION `~`~. ~~`"~~ <br />Four fish species endemic to the upper Colorado River Basin are currently listed <br />as endangered by the U. S. Fish and Wildlife Service (FWS). These species, Colorado <br />squawfish (Frychocheilus Lucius), razorback sucker (Xyrauchen texanus), humpback chub <br />(Gila cypha) and bonytail chub (G. elegans), are managed under the auspices of the <br />Recovery Implementation Program for Endangered Fish Species of the Upper Colorado <br />River Basin (RIP; FWS 1987). RIP is amulti-agency effort dedicated to recovery of the <br />four species while allowing water uses and development consistent with the Upper <br />Colorado River Compact of 1922. An integral part of RIP is annual monitoring of <br />populations to determine population status and trends. Although monitoring began early <br />in the 1970's, methodology and sampling locations were not standardized ,until 1986. <br />That year the numerous agencies involved with management of these fishes instituted the <br />Interagency Standardized Monitoring Program (ISMP). The intent of ISMP is to provide <br />standard methods of data collection which would allow for direct and completely <br />comparable information from year to year. Two of the primary aspects of the program <br />are spring electrofishing to monitor late-juvenile and adult populations of squawfish and <br />fall seining to monitor young-of-the-year (YOY) squawfish (productivity and growth). <br />The Utah Division of Wildlife Resources (UDWR), being the legal fish <br />management agency within the state of Utah, was given responsibility to conduct. <br />monitoring activities within Utah. This includes all of the Green River from its mouth to <br />the Colorado-Utah state line. Monitoring of the river south of River Mile (RM) 215 is <br />the responsibility of the UDWR Southeastern Region offices in Moab and Price. The <br />river above RM 215 became the responsibility of the UDWR Northeastern Region office <br />in Vernal. The information. presented in this report details monitoring activities in the <br />Green River between RM 215 and RM 334 and the lower. 21 miles of -the White River <br />from 1990 through 1994. <br />1 <br />