The fisher (Martes pennanti) is a medium-size carnivore (Family Mustelidae), the largest of 7 extant species comprising the genus Martes (Buskirk 1994). The historical distribution of fisher was limited to North America (Hall 1981: 987) and corresponded with Merriam's (1898) Canadian and Transition Life Zones (Strickland and others 1982), where it occurred throughout northern forests (Powell 1981; Powell and Zielinski 1994). Fisher populations declined dramatically following European settlement and were extirpated from a large portion of their range in the United States and eastern Canada. Populations rebounded in the mid20th century (Gibilisco 1994) and today fisher populations are reported in 2nd-growth forests from northern Ontario and Minnesota eastward (Powell 1993, Powell and Zielinski 1994). In the West, fishers apparently are associated with late-successional forest habitat (Aubry and Houston 1992), but their current distribution and status are in question (Gibilisco 1994). Fisher populations are formally protected in Oregon, Utah, Washington, and Wyoming (Powell and Zielinski 1994). Because of the uncertain status of the fisher across much of its historical range and the concern for its longterm viability, new information regarding its distribution may be valuable in assessing its current situation and in planning future management. The purpose of this note is to draw attention to an observation of fisher in the central Rocky Mountain region where it was previously undocumented. While hiking Hidden Falls trail in Grand Teton National Park on 6 July 1995, I saw a fisher run across the trail within a distance of 10 m. The trail was within 50 m of a shoreline along the western edge of Jenny Lake (43°46'N, 110°44'30W). The observation occurred between 0900 and 1000 hr MDT; the sky was mostly clear and the temperature was about 10 to 15°C. The fisher was moving from the lakeshore with a fish in its mouth towards a more densely forested area. The immediate vicinity of the trail was scrubby, sparsely forested habitat with trees, mostly lodgepole pine (Pinus contorta), <10 m tall. The animal trotted to a small boulder about 30 to 40 m from the trail, climbed onto the boulder, and began to eat the fish, which it placed on the boulder. Using a pair of 10 X 40 Zeiss binoculars, I watched the fisher eat its fish for 2 to 3 minutes. The animal frequently looked in the direction of the trail. The fisher then seized the fish with its mouth, left the boulder, and moved farther into the forest where it was no longer visible. The entire incident lasted about 5 min. This observation is significant for 3 reasons. First, there are few published references to fish as a diet item of fishers. Fishers are opportunistic and generalized predators and their diet varies considerably with availability of prey (Strickland and others 1982; Powell 1993; Powell and Zielinski 1994). Powell and Zielinski (1994) reported fish in the miscellaneous category; but whether the sampled individuals scavenged remains of fish or if fish were taken as prey from a stream or lake is uncertain. Fishers readily eat carrion (Powell and Zielinski 1994). Second, the precise distribution of fishers in Wyoming is in question (Gibilisco 1994). Fossil and subfossil evidence (Graham and Graham 1994) suggest that the fisher previously had a more southern distribution than has been represented in recent times (Anderson 1970). None of the recent published historical range maps (Hagmeier 1956; Hall 1981; Strickland and others 1982; Clark and Stromberg 1987; Douglas and Strickland 1987; Gibilisco 1994) or descriptions (Powell and Zielinski 1994) include westcentral Wyoming. Despite the efforts of Hagmeier (1956) to document the range of the fisher (Strickland and others 1982), considerable disparity exists among authors regarding both