Abstract.-The objectives of the study were to determine the survival rate of hatchery-reared lake trout (Salvelinus namayeush) stocked as yearlings in the West Arm of Grand Traverse Bay, Lake Michigan during the 10-day period following planting, and the annual survival rate as 1-, 2-, and 3-year -old fish. Average survival of the yearling lake trout during the 10-day period following planting was estimate to have been 68%, which included removals by experimental fishing. The annual survival rate (including post-planting losses) of yearlings was determined to have averaged 40%. For 2-year-old lake trout the mean annual survival rate was estimate to have been 59%. The annual survival rate of 3-year-old lake trout could not be determined because 4-year-old lake trout were not fully vulnerable to the trawl. In the West Arm of Grand Traverse Bay, lake trout planted as fall fingerlings survived to 2 years of age at one-half the rate of the same year class planted as spring yearlings.