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PROCEEDINGS OF THE DESERT FISHES COUNCIL 1993 - VOLUME XXV (November) the Parker FRO assisted with ongoing research being conducted on razorback suckers on Lake Mohave, actively netting the reservoir and again working Yuma Cove to remove fish from that facility. Subsequent to that effort, the FRO participated in rotenoning Yuma Cove to remove all fish. FRO staff also surveyed the canals on Colorado River Indian Tribes (CRIT) land near Parker, during their yearly drawdown (January). This resulted in ten razorback suckers being recovered from the canal system. Muscle plugs were removed from all fish and given to Dr. Tom Dowling (ASU) for analyses. Additionally, in January 58 adult razorbacks were collected from the Colorado River between river miles 42-61, near Hoover Dam. On 17 February, 853 razorback suckers were stocked into Lake Havasu on the Bill Williams River NWR. Fifty additional fish were stocked into 12 mile lake on the CRIT. These fish were larger fish (450-500 mm TL) and were the 1990 year class produced by Dexter National Fish Hatchery and Technology Center (DNFHTC) All of the fish were PIT-tagged. During Spring (March) razorback suckers were again received from DNFHTC. Some of these fish were put into selected coves on Lake Mohave and represent the 1991 hatch. In addition to this, a major collecting effort was accomplished on Lake Mohave. During the week of 14-19 twenty people representing 5 agencies and private organizations collected a total of 750 razorback suckers. Of these fish 15 % were recaptures including 3 small fish which had been produced in Yuma Cove in 1992! Later, in April, the remaining fish which were received from DNFHTC in March were placed in the Pittsburgh Point backwater on Lake Havasu. The majority of the individuals were PIT-tagged and to date 16 have been recovered. Of those individuals, the average increase in growth was 3 cm and 122 gins. This research on Lake Havasu is part of a major program between the Bureau of Land Management, U.S. Fish and Wildlife and several other entities. It is a part of the Lake Havasu Fisheries Improvement Project. Summer monitoring of this species in 1993 has resulted in one fish being recovered from the February stocking at 12 mile lake. None of the 1990 fish have been recovered from Lake Havasu. Bonytail Chub (Gila elegans): During October 1992, 6,617 bonytail chubs were introduced into Lake Mohave at Davis Cove. These fish averaged 71 mm TL and were from DNFHTC. They represented the 1992 volunteer recruitment produced by the broodstock being maintained at Dexter. Some individuals were also larger and were from earlier years (1990-1991?). A subsample of these fish was taken for allozyme and mtDNA analyses. In May, 14 adult bonytail chub were collected from Lake Mohave. These fish were transferred to Willow Beach National Fish Hatchery and subsequently to DNFHTC. Several of the fish were in spawning condition, with tubercles and color. Both sexes were taken but no females expressed eggs. At this time four of these fish remain alive. Currently, facilities are being prepared on the Bill Williams River NWR and Cibola NWR for both bonytail chub and razorback suckers. These sites will be renovated and fish will be placed into them by the end of 1993. Little Colorado Spinedace (Lepidomeda vittata): During 1992-1993, support has been provided to The Arboretum in Flagstaff, Arizona, to develop a refugium and an interpretive kiosk for public education. The research is being conducted by Northern Arizona University. Additionally, the FRO has produced a Draft recovery plan for this species which is in review. Other Native Fishes: During 1993, a program was initiated in conjunction with the Bill Williams NWR to re-introduce extirpated nonlisted native fish onto the refuge waters. This summer longfin dace (Agosia cluysogaster), roundtail chub (Gila robusta) and Sonora sucker (Catostomus insignis) were placed into the Bill Williams River on refuge lands. These fish will be monitored to track their success. Supplemental stockings are also planned for 1994. Other Activities: Other activities include participation in the Desert Fishes Recovery Team and Native Fishes Workgroup. Duties also included review of the Gila Topminnow, Razorback Sucker, Yaqui Fishes and Virgin River Fishes recovery plans as well as the Biological Support document for the proposed critical habitat listing for big river fishes. Additionally, numerous meetings and other activities pertaining to native fishes occurred. Acknowledgments: The Parker FRO provided support to, and was assisted by: Arizona Game and Fish Department, Arizona State University, Bill Williams River NWR, Bureau of Reclamation, Bureau of Land Management, Cibola NWR, Colorado River Indian Tribes, Forest Service, Hualapai Tribe, National Park Service, Nevada Department of Wildlife, Northern Arizona University, U.S. Fish and Wildlife Service to include; AZFRO personnel, Fisheries, Region II, Ecological Services(Phoenix and Albuquerque) and numerous private individuals. RESUMEN El siguiente informe presenta actividades de la oficina de Recursos Pesqueros (FRO) en Parker, Arizona, comprendido entre el 3 de agosto de 1992 hasta el presente. En la mayoria de los casos esta oficina tuvo Como principal actividad, proporcionar ayuda a las varias organizaciones que enseguida se enlistan. Matalote jorobado (Xyrauchen texanus): Durante agosto de 1992, el FRO auxili6 en la reintegraci6n del matalote jorobado desde la Ensenada de Yuma en Lago Mohave. Los peces recapturados fueron puestos en la