Sport-fishing catch from Gladstone Lake, a 481-acre hard-water bass-panfish lake in north-central Minnesota, averaged 24.3 pounds (about 65 fish) per acre over a 7-year period (1952-58). Of the weight of fish taken 25.4 percent was larger predaceous fishes, including 13.4 percent (3.2 pounds per acre) of largemouth bass (Micropterus salmoides). Panfishes, especially bluegill (Lepomis macrochirus), made up the bulk of the catch. Average summer fishing pressure over the 6 years was 37 hours per acre and of the same magnitude as that for other bass-panfish lakes in this area. The fish population was sampled by seining in 1957 and 1958 and size of the bass population estimated by marking and recovery methods. In 1957 there were estimated to be 11,000 bass 6 inches or longer (23 per acre); in 1958, 5,500 (12 per acre). Approximately 50 percent of this decline was attributed to poor recruitment from the 1955 year class. The exploitation rate was 14.6 percent in 1957 3.5 bass per acre) and 15.6 percent in 1958 (1.8 per acre). Total fishing pressure was 29.9 hours per acre in 1957 and 27.3 in 1958. Fishing mortality of age-IV and older bass was 15 percent during the 2 years, and estimated natural mortality, 47. Age-groups IV and younger were taken incidentally to panfish angling. Larger bass were caught mostly by anglers fishing specifically for them. During the 2 years 30 percent of the total fishing pressure was directed at largemouth bass and 50 percent at panfishes. Catch of the smaller bass appears to be related to the goodness of panfish fishing. The population of larger bass declined 30 percent from 1957 to 1958, but the catch declined 48 percent and fishing pressure for larger fish declined 55 percent. The catch of smaller bass declined 35 percent and the population declined about 55 percent. Age-groups V-VIII (1 to 3 pounds) were taken in both years in greater proportion to their numbers than ages IX and older (3.5 to 5.0 pounds). Angling habits and success of panfish anglers had considerable influence on the bass catch. Opening the bass season 2 weeks earlier in 1957 and 1958 than in the 5 preceding years had little influence on the catch and about half the fish were taken during the first month in both instances.