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PREFACE A work group, consisting of members of the Propagation Subcommittee and Biology Committee met in Grand Junction, Colorado on September 1, 1992 to discuss propagation needs for endangered fishes in the Upper Colorado River Basin. However, the draft document (Williamson 1992a) from this meeting was not finalized. Therefore, the Chairman of the Management Committee requested that the Chairman of the Biology Committee proceed with development of a final coordinated hatchery facility plan for recovery of the endangered fishes in the Upper Colorado River Basin (Evans 1992). Arrangements were made to have the work group discuss endangered fish and propagation facilities required for the recovery effort of endangered fishes in the Upper Colorado River Basin. This meeting was held during February 9-10, 1993 in Grand Junction, Colorado. Work group participants included Mike Baker, U.S. Fish and Wildlife Service; Larry Crist, Bureau of Reclamation; Brandt Gutermuth, Utah Division of Wildlife Resources; Larry Harris, Colorado Division of Wildlife; Leo Lentsch, Utah Division of Wildlife Resources; Chuck McAda, U.S. Fish and Wildlife Service; Tim Modde, U.S. Fish and Wildlife Service; Tom Nesler, Colorado Division of Wildlife; Frank Pfeiffer, U.S. Fish and Wildlife Service; Steve Severson, U.S. Fish and Wildlife Service; Don Toney, U.S. Fish and Wildlife Service; Joe Valentine, Utah Division of Wildlife Resources; Holt Williamson, U.S. Fish and Wildlife Service; and Dick Wydoski, U.S. Fish and Wildlife Service - Retired. This document summarizes recommendations made by the work group on February 9- 10, 1993, discussions by the Biology Committee participants at four meetings (March 9-10, 1993, July 20, 1993, August 18, 1993, and September 16, 1993), comments received from Biology Committee and Propagation Subcommittee members y, on three draft manuscripts, information in various reports and publications, and telephone conversations with persons who are knowledgeable about the biology and propagation requirements of the endangered Colorado River fishes. Although the Biology Committee agreed in general concept with the April 15, 1993 document, consensus could not be reached on the final document. The content of this plan and specific recommendations are my perceptions of majority agreement by Biology Committee members on captive-reared endangered fish and facility needs for the Recovery Implementation Program in the Upper Colorado River Basin. In a recent paper published in Science "Uncertainty, Resource Exploitation and Conservation: Lessons from History", Ludwig et al. (1993) stressed that action must be taken on the best available information before events occur that are irreversible. This document provides reference information and specific recommendations that will aid in applying adaptive management procedures regarding the propagation of endangered Colorado River fishes. Richard S. Wydoski May 25, 1994 i xiii