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- 5 - TREATMENT TECHNIQUES Project Economics The justification of any stream or lake fish management program is largely dependent on the probable recreational utilization to be served. Because a project of the scope of that on the Green River requires very sizable expenditures of time and money, such estimates should be made as accurately as possible. In 1959 a recreational use projection was made for the Flaming Goz•ge Reservoir, based on the 1955 National Survey of Fishing and Hunt ing,l the 1950 Government census, and a1.1 available state fishing-use data. In this projection a figure of 120,000 annual fisherman days was estimated for the reservoir and tailwater initial use. Applying a National average fisherman-day expenditure of $5.36 to the Flaming Gorge fishery, the total initial annual fishing expenditure would be in excess of $643,200. After tyre 1960 Government census figures were available, it became obvious that the original population and fishermen estimates were too low. According to the figures in the 1960 National Survey, 2 freshwater fishermen numbers increased by about 18 per cent from 1955 to 1960. If this increase should continue at the same rate from 1960 to 1975, it is reasonable to surmise that fisherman use will be at least proportional. By 1975, the annual use on the Flaming Gorge Reservoir would be a minimum of 185,000 fisherman days with a total annual expenditure of at least $991,600. Most available data indicate that Intermountain Area fishing use and expenditures exceed the National averages. " Preliminary River Mapping and Flow Estimation A determination of the extent of the stream areas to be treated involved location of the upper limits of carp populations detrimental to trout fishery development. While the goal of the entire project was the reduction of all nondesirable fish in the river proper, the upper area treatment was specifically aimed at the carp and its potential population explosion from the proposed Seedskadee Reservoir near LaBarge. This was ~~ effected over two summers and included an intensive inventory of fish populations by various electro-fishing and netting techniques. Representa- tive sections of the Green, New Fork, and East Fork Rivers, as well as the lower reaches of all nenintermittent tributaries, were checked, and the upstream limits of all carp waters were carefully established. Next the upstream treatment station sites were located sufficiently far above carp population limits for a reasonable assurance of the complete inclusion 1. U.S. Fish and Wildlife Service, 1955. National Survey of Fishing and Hunting, Circular ~+~+, 50 pp . 2. U.S. Fish and Wildlife Service, 1960. National Survey of Fishing and Hunting, Circular 120, 73 pp. -:~,am ~~R,4k~'(`-^. ,,<.n ~.'^s..y~"'+fil,>,:ra, t`rr x~'~^•.:-.~-.~ -v ~~:b~,aa-@S"~",,~'. ae,+w~a~r~r, .,.-,~ _.,,.,,r,,y. ~,..,..-.~... ,. ~-x". rg~ +c ~~_ :;~; ivo _ ~. 1 ,.