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376 GREAT BASIN NATURALIST [Volume 56
<br />fish were collected during draining. The fol-
<br />lowing species were represented in order of
<br />contribution by weight: Cyprinus carpio, Pinte-
<br />phales pronielas, Lepomis cyanellus, Ietalurus
<br />punctatus, Ameiurus melts, Cyprinedla lutren-
<br />sis, Pomoxis nigromaaulatus, Xyrauehen tex-
<br />anus, Esox lucius, Gila atraria, Catostomus
<br />latipinnis, Catostomus commersoni, Ptychoche-
<br />dus lucius (7 individuals ranging in TL be-
<br />tween 175 and 207 mm, and weight from 33 to
<br />62 g), Gila robusta, and Culaea inconstans.
<br />Tyus and Karp (1990) reported that razor-
<br />back sucker spawn on the ascending limb of
<br />the hydrograph, allowing drifting larvae to
<br />disperse during peak runoff and thus maximiz-
<br />ing access to wetland habitats. It is unknown
<br />whether the juveniles collected during drain-
<br />ing originated from riverine spawning sites or
<br />were produced in Old Charley Wash. How-
<br />ever, their occurrence in Old Charley Wash in
<br />1995 supports speculation (Tyus and Karp 1990,
<br />Modde et al. 1966) that floodplains may be
<br />important razorback sucker nursery areas.
<br />Support for this study was provided by the
<br />Recovery Implementation Program for the
<br />Endangered Fishes of the Upper Colorado
<br />River Basin. Thanks to T. Hatch, C. Flann, N.
<br />Hoskin, D. Irving, B. Haines, R. Nicoles, K.
<br />Day, and K. Kaczmarek for assisting in fish
<br />collections.
<br />LITERATURE CITED
<br />220-239 in D. P. Dodge, editor, Proceedings of the
<br />International Large River Symposium. Canadian Spe-
<br />cial Publication of Fisheries and Aquatic Sciences
<br />106, Ottawa.
<br />COWARDIN, L. M., V CARTER, F C. GOLET, AND E. T LA
<br />ROE. 1979. Classification of wetlands and deepwater
<br />habitats of the United States. U.S. Department of
<br />Interior, U.S. Fish and Wildlife Service, FWS/OBS-
<br />79/31. 131 pp.
<br />GUTERNIUTH, F. B., L. D. LENTSCH, AND K. R. BESTCEN.
<br />1994 Collection of age-0 razorback suckers (kyrau-
<br />chen texanus) in the lower Green River, Utah. South-
<br />western Naturalist 39: 389-391.
<br />LANIGAN, S. H., AND TYus, H. M. 1989. Population size
<br />and status of the razorback sucker in the Green River
<br />basin, Utah and Colorado. North American Journal
<br />of Fisheries Management 9: 68-73.
<br />MINCKLEY, W. L., P C. MARSH, J, E. BROOKS, J. E. JOHN-
<br />SON, AND B. L. JENSEN. 1991. Management toward
<br />the recovery of the razorback sucker. Pages 303-357
<br />in W. L. Minckley and J. E. Deacon, editors, Battle
<br />against extinction: native fish management in the
<br />American West. University of Arizona Press, Tucson.
<br />MoDDE, T., K. P. BURNHAM, AND E. E WICK. 1996. Popu-
<br />lation status of the endangered razorback sucker in
<br />the Middle Green River. Conservation Biology 10:
<br />110-119.
<br />TARA, S. S., J. R. MURPHY, AND H. H. FRosT. 1965. Notes
<br />on the fishes of the Colorado River near Moab, Utah.
<br />Proceedings of the Utah Academy of Sciences, Arts,
<br />and Letters 42: 280-283.
<br />TYus, H. M., AND C. A. KARP. 1990. Spawning and move-
<br />ments of razorback sucker, X yrauchen texanus, in the
<br />Green River basin of Colorado and Utah. Southwest-
<br />ern Naturalist 35: 427-433,
<br />U.S. FISH AND WILDLIFE SERVICE (USFWS). 1991. Endan-
<br />gered and threatened wildlife and plants: the razor-
<br />back sucker (Xyrauchen texanus). Determined to be
<br />an endangered species. Federal Register 56(205):
<br />54957-54967.
<br />BEHNKE, R. J., AND D. E. BENSON. 1983. Endangered and
<br />threatened fishes of the Upper Colorado River basin. Received 6 November 1995
<br />Colorado State University Cooperative Extension Accepted 21 June 1996
<br />Service, Bulletin 503A.
<br />CARLSON, C. A., AND R. T MUTH. 1989. The Colorado
<br />River: lifeline of the American Southwest. Pages
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