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fishery. Creel rates and harvest reached a peak in 1965 (Schmidt et al. 1980b) and a general decline in the rainbow fishery has occurred since that time. Utah chubs (Gila atraria) and later, white suckers (Catostomus commersoni) became established in the reservoir. Competition for food and space with these two rough fish species, especially the Utah chub, resulted in the decline of the rainbow trout fishery and prompted the first stocking of brown trout (Salmo trutta) in the Inflow Area during 1966. The brown trout grew rapidly in the presence of a rapidly expanding Utah chub population. By the late 1970's a nationally acclaimed trophy brown trout fishery had been established with a 33 pound 12 ounce fish establishing a new North American record. Flaming Gorge has been managed primarily as a rainbow trout fishery since 1963. In 1982, management of the reservoir turned to include the trophy brown trout fishery, as well as the developing trophy lake trout fishery. Lake trout (Salvelinus namaycush) became established naturally in the reservoir through downstream drift from the Finger Lakes on the upper Green River. Lake trout did not appear in gill net sampling until 1977, although lake trout were reported in the creel as early as 1971. Other species of fish which have been introduced to fulfill specific management objectives include kokanee salmon (Oncorhyncus nerka), several sub-species and strains of cutthroat trout (Salmo clarki), smallmouth bass (Micropterus dolomi_eui), largemouth bass (M. salmoides), and channel catfish (Ictaluras punetatus). Flaming Gorge Reservoir has been cooperatively studied and managed by the Wyoming Game and Fish Department and Utah Division of Wildlife Resources since 1963. During this time, investigations leading towards specific fishery manage- ment practices have been supported by the Bureau of Reclamation (Section 8 Funds), United States Fish and Wildlife Service (Dingell-Johnson Funds), and state funds. Funding by these agencies has created a wealth of publications by both state agencies dealing with various facets of the fishery resource. This report deals with fishery management investigations from July 1, 1977 through June 30, 1983. The report summarizes all the annual reports from 1977 through 1982 and includes data collected during the spring of 1983. These investigations were funded.by the United States Fish and Wildlife Service (Dingell-Johnson Funds) and state appropriations. The report summarizes creel surveys leading to harvest; age and growth ana- lysis and utilization estimates; gill netting, electrofishing, and purse seining activities to determine population trends; food habits and other life history data of fish species in the reservoir; the marking and stocking of game fish to meet specific management goals; yearly enumeration and surveillance of kokanee and brown trout spawning in the Green River above Flaming Gorge Reservoir; and recruitment from reproduction in the Green River; the monitoring of the lim- nology of the reservoir and review of environmental impact statements and plans which would affect the fishery resource in the reservoir; literature reviews which were pertinent to the research and management of the reservoir; and the analysis of data and preparation of annual reports on the Fishery Management Investigations of Flaming Gorge Reservoir (F-44-R). The fisheries management objectives for Flaming Gorge Reservoir are as follows: