Similar patterns of dispersion were observed over 90-day periods among hatchery-reared rainbow trout and rainbow-steelhead hybrid trout released in the Lake Washington system in 1966 and 1967. In both experiments 90% of recaptures were within 3.2 km of the release site. Returns were generally the same for the three tags tested (Carlin dangler, Petersen disk, Floy anchor pendant). Of the total fish released in 1966, 47.3% were recovered, and of those in 1967, only 40.5%. A reward was offered in the 1966 experiment. Loosening and loss of tags and infection of tag wounds appeared minimal.