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history and ecology on the Colorado squawfish is needed. Artificial propagation of the squawfish will be attempted at Willow Beach, Nevada, National Fish Hatchery. 41. Behnke, R. J. 1973. Humpback chub, Gila TAXONOMY cypha. Threatened and Endangered Fish DISTRIBUTION Report, Colorado Cooperative Fish Unit, DESCRIPTION Colorado State University, Fort Collins LIFE HISTORY for U. S. Fish and Wildlife Service, ECOLOGY Region 2, Albuquerque, New Mexico. 5 pp. ENDANG. FISH POPULATION This paper discusses the taxonomy, the range 2 and distribution, and the life history and ecology of the endangered humpback chub (Gila cypha). Further sampling in the Grand Canyon or above Lake Powell may find a remnant popula- tion which would then need to be studied for hybridization with G. elegans, feeding, reproduc- tion, and life history. 42. Behnke, R. J. 1973. Humpback sucker, Xyrauchen LIFE HISTORY texanus. Threatened and Endangered Fish DESCRIPTION Report, Colorado Cooperative Fish Unit, ECOLOGY Colorado State University, Fort Collins, DISTRIBUTION for U. S. Fish and Wildlife Service, ENDANG. FISH Region 2, Albuquerque, New Mexico. 7 pp. TAXONOMY ABUNDANCE This paper concerns the humpback or razorback 4 sucker (Xyrauchen texanus). The taxonomy, range and distribution, and the life history and ecology of this rare species is discussed. Research needs are the study of the reproduction and early life history of Xyrauchen and the establishment of where populations are currently being maintained and at what level of abundance. 43. Behnke, R. J. 1973. Kendall Warm Springs ENDANG. FISH dace, Rhinichthys osculus thermalis. -LIFE HISTORY Threatened and Endangered Fish Report, TAXONOMY Colorado Cooperative Fish Unit, Fort ECOLOGY Collins for U. S. Fish and Wildlife DISTRTBUTION Service, Region 2, Albuquerque, New 6 Mexico., 4 pp. This paper discusses the taxonomy, range and distribution, and the life history and ecology of the Kendall Warm Springs dace (Rhinichthys 27