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- 2 - Generally, good trout habitat was found to extend from the upper reaches of the project area downstream to the town of Green River. Below the town the river courses through highly erosive country, and game fish habitat is limited by the effects of siltation and adverse water temperatures. Non-game fish species, including suckers, chubs, and carp, comprised the bulk of the fish populations found in the study area. The advent of the Flaming Gorge Reservoir and the Fonte nelle Reservoir (8,000 surface acres} with the resultant changes in the aquatic environment would produce game fish habitat where none previously existed as well as provide excellent opportunity for the rapid expansion of the existant non-game species. It has been well established that the drastic environmental changes resulting from the construction of a new reservoir usually results in population explosions of the fish present. If such an explosion potential involves undesirable fish species drastic reduction of these species must be effected prior to development of a successful sport fishery. In some instances this explosion has produced an upstream emigra- tion of management significance. In the aquatic habitat resulting from Bcysen Dam, on Wyoming's Wind River, carp populations have become so exces- sive that this species dominates not only a good portion of the lentic water of the reservoir, but also much of the lotic water many miles upstream. This dominance and spread of carp into habitat normally suitable for trout has seriously reduced the game fish producing potential of these waters. It should be mentioned that a good trout fishery did exist in Boysen Reservoir for a two-year period prior to the population explosion of less desirable species. In this case no effort was made to control these less desirable species prior. to impoundment. In the North. Platte River, in Wyoming, two rotenone treatment programs have been completed with encouraging results. A stream treatment project (Petersen, :958), completed just prior. to the closure cf Glendo Dam; has resulted in five years of good trout fishing in the reservoir proper. Stream habitat, above the reservoir, is producing a limited trout fishery and gives every indication of becoming a more important fishery. A second treatment project on the North Platte River was associated with Pathfinder Reservoir. Prior to 1957, carp and longnose and common white suckers were abundant in the reservoir. Despite repeated trout stock- ing programs and limited non-game fish control programs, the trout fishery remained poor. In 1958, installation of electrical generating facilities necessitated evacuation of most of the :reservoir's watex•. Chemical treat- ment was cafried cut in reservoir pct-roles and tributary streams. Test- r_et results, as of this writing, indicate. no carp, and the r°ese.rveir is producing an exceptional treat fishery. ~~