Abstract.-Lake trout Salvelinus namaycush eggs were planted on two Lake Michigan and nine Lake Huron reefs during 1973-81 to evaluate this method to propagate lake trout. Most eggs were taken from hatchery broodstock and incubated in a hatchery to the eyed stage. Eggs were planted either by releasing them at the surface or by scuba divers who released them just above the substrate. The number of eggs planted at each site ranged from 27,000 to 6,600,000. Survival of eggs to hatching was assessed by placing samples of eggs in containers on the sites. Many containers on offshore reefs were moved by severe turbulence during the winter and were lost. Mean survival of eggs to the fry stage in containers on protected nearshore sites averaged 77% prior to early June, then decreased. Prolonged confinement in the containers probably was the cause of the low survival after mid-June. Emergent fry traps were used to collect swim-up fry during 1977-82. Fry production was estimated by extrapolation of the number of fry caught. Survival from planted egg to swim-fry was 1.8% or less. Gill nets fished over the planting sites 6 to 8 years later caught 60 fin-clipped, hatchery-reared lake trout, but only one unclipped lake trout. That fish could have been either a survivor from the planted eggs, from successful natural reproduction, or a hatchery fish that was improperly clipped. Planting eyed eggs by seeding them on reefs is not a practical method to propagate lake trout.