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Although a number of species have become threatened or endangered because of over-exploitation and elimination as competitors with species desired by man, most species are jeopardized because their habitat has been destroyed or altered (Miller, 1963; Behnke, 1968; Minckley and Deacon, 1968; Fischer, Simon, and Vincent, 1969; Udall, 1970; Carter, 1973; Reiger, 1977; Myers, 1977; Holden and Stalnaker, 1975; Vanicek and Kramer, 1969). Histor- ically, decisions involving water resource development were made at all levels of government with little public involvement. In as much as the public has now become more involved, however, and will continue to be involved in decisions affecting the environment (McEvoy, 1973) it is reason- able to assume that the environmental concerns of the public will be consid- ered along with other factors in the development and use of natural resources. Goldman (1973) believed that economic growth and environmental priorities can be compatible if the social and economic needs of the people are balanced with the environment. However, Barkley and Secker (1972:12) stated that "contrary to popular belief, economists have historically been skeptical of the long-run advantages of economic growth." History provides many examples of man's indifference or ambivalence toward his fish and wildlife heritage (Udall, 1970; Carter, 1973). If ecological consideration had been included, much of the destruction or alteration to the environment would not have occurred. If the stability of ecosystems is maintained, fish and wildlife resources are not damaged or destroyed. In the future, plans for management of entire watersheds will incorporate environmental considerations (Hickman, 1975). In addition, cooperation between the various state and federal agencies--and sometimes other nations--will be required for management of fish and wildlife, particularly of endangered species (Greene, 1975; Schreiner and Ruhr, 1974). Recently, personnel at the Utah Cooperative Fishery Research Unit compiled an annotated bibliography, for the use of the Colorado Squawfish Recovery Team, distribution, relative abundance, and ecology of fish and macroinvertebrates in the Upper Colorado River Basin (Wydoski, Gilbert, Seethaler, and McAda, 1976). As this reference was being assembled, it became apparent that other subjects should be included because they could have a direct or indirect effect on the aquatic environment, and conse- quently on the aquatic organisms that inhabit this river. Many of the papers included in that bibliography were used to prepare a summary of the present knowledge of the effects of various management practices on fish and macro- invertebrates in the Upper Colorado River, and to identify potential effects of future alterations in streamflow and water quality on these or- ganisms (Wydoski, 1977). These references further emphasize the application of the ecosystem approach to management of river basins. Cairns (1975) concluded that the protection of critical ecosystems appeared to be a sound- er management strategy than the protection of critical species. Cutler (1974) emphasized that agency information and education divisions need to involve the public in agency decision-making. He proposed that the public should be "adequately informed" about the social, economic, and en- vironmental in-.)acts of practical alternatives regarding natural resources, so it can decide what it wants for its money. Kozicky (1969) stated that 7