Upper Angora Lake in the high Sierra Mountains was selected for an experimental study conducted from 1934 to 1936, inclusive. It is a small 5-acre lake lying at an elevation of 7,800 feet, 7 miles south of Lake Tahoe. General ecological conditions and management problems of such high lakes are discussed. Low water temperatures over most of the year limit both growth of fish and production of aquatic foods. The standing crop of bottom foods averaged 49 pounds (wet weight) per acre. Dominant aquatic foods were midge larvae, bristle worms (oligochaetes) and scuds (Hyalella). Stomach examinations of trout indicated that dominant foods eaten were midge larvae and pupae. Aquatic organisms formed over 66 per cent by number of foods eaten. Two lots of marked eastern brook trout were planted, one of 5,028 averaging about 2 inches in length, and another of 2,080 averaging 5 1/2 inches in length. The small fish were planted in September and the larger in June 1935. Both lots were marked by removal of fins. The lake outlet was screened to prevent fish from leaving the lake. A Creel census was taken throughout the angling seasons of 1934, 1935 and1936. Only weight, species, date of capture, and the presence or absence ofmarks were recorded. No record was kept of the length of time each anglerfished or of anglers who failed to catch fish. Catches of both marked and unmarked fish totaled 89 trout in 1934, 809 in1935, and 211 in 1936. Eastern brook trout were dominant in the catches. Afew rainbow and brown trout were taken each year. Over the 3-year period covered, only 4.3 per cent of the 5,080 2-inch easternbrook trout, and 25.6 per cent of the 5 1/2-inch fish, were reported caught.Judging from the results of work presented iu this paper and the results ofthe work of other iuvestigators cited, losses of trout planted are extremelyheavy regardless of the size of fish planted. Better survival of small 2-inch trout was obtained after three winters inthe lake than for 5 1/2-inch fish after only one winter in the lake. Markedfish of both plantings formed 77 per cent and 58 per cent, respectively, of fishcaptured and retained in 1935 and 1936. No marked fish were reported in1934. The planting of small eastern brook trout made in the fall of 1933contributed most fish to anglers the second year after stocking. The plantingof larger trout contributed most in the same season in which they werestocked. The small marked trout grew at a rate of over 2.5 inches per yearfor the 3-year period covered by the ereel census, and the larger grew at arate of 1.7 inches per year. Production in pounds per acre was 15.8 in 1934, 21.2 in 1935, and 17.0 in1936. Eastern brook trout formed 28 per cent by weight of all trout landedin 1934, 93 per cent in 1935, and 48 per cent in 1936. Age determigrations from scale studies indicated that the majority of east-ern brook trout caught were in their third year, and the presence of incomingyoung in their first and second years gave evidence of successful naturalpropagation in the lake. No rainbow trout less than 3 years old or browntrout less than 5 years of age, were present in the samples studied. Fifteen brown trout that averaged 2.18 pounds each and weighed up to 7pounds were reported caught in 1936. Predation by a few large brown troutis suggested as one cause of the low survival of planted trout and the removalof such fish by selective gill-netting operations is presented as a possiblemanagement measmˈe in lakes where destruction of entire populations bypoisons or other means is not desired.