Mark-recapture experiments were conducted to estimate the abundance of cutthroat trout Oncorhynchus clarki in Florence Lake on Admiralty Island, near Juneau, in 1993. The abundance of cutthroat trout in Florence Lake was an estimated 8,382 (SE = 818) for fish 180 mm fork length. Baited funnel traps and hook and line were used to capture fish during four sampling trips between April 22 and June 12, 1993. To capture ripe cutthroat trout for disease and fecundity sampling, two weirs were operated on inlet streams between April 22 and June 10, 1993. We captured 98 cutthroat trout: 81 immigrants and 17 emigrants.