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out the abundance of interspecific genetic diversity of some salmonid fishes manifested in ecological and behavioral specializations, but not necessarily by morphological divergence. Innate reproductive homing behavior of salmonid fishes may allow closely related populations to exist in sympatry and maintain reproductive isolation. Examples are cited to support the contention that many sympatric "sibling species" have evolved from a common ancestor in post- glacial times. Closely related, sympatric populations are a major taxonomic problem, but this phenomenon which allows a species to consist of genetically discrete units with reproductive isolation between the stocks is of great significance for fisheries management. Postglacial salmonid communities are typically fragile and highly susceptible to disruption or destruction by introductions, eutrophication, and exploitation. Every effort should be made to protect the genetic diversity of a species. 39. Behnke, R. J. 1973. Bonytail chub, Gila elegans. Threatened and Endangered Fish Report, Colorado Cooperative Fish Unit, Colorado State University, Fort Collins, for U. S. Fish and Wildlife Service, Region 2, Albuquerque, New Mexico. 8 pp. The bonytail chub (Gila elegans) is discussed as to taxonomy, range and distribution, and life history and ecology. Further research is needed in the area of extensive surveys to find where populations may exist and in reproduction and early life history. 40. Behnke, R. J. 1973. Colorado squawfish Ptychocheilus luciixs. Threatened and Endangered Fish Report, Colorado Cooperative Fish Unit, Colorado State University, Fort Collins for U. S. Fish and Wildlife Service, Region 2, Albuquerque, New Mexico. 9 pp. The taxonomy, range and distribution, and the life history and ecology of the endangered Colorado squawfish (Ptychocheilus lucius) is covered in this paper. Management recommenda- tions given are that more knowledge on the life ENDANG. FISH TAXONOMY DESCRIPTION DISTRIBUTION LIFE HISTORY ECOLOGY SURVEY 1 ABUNDANCE, DESCRIPTION DISTRIBUTION ECOLOGY LIFE HISTORY ENDANG. FISH MANAGEMEN T 3 ,~ 26