Two experiments were conducted between October 4, 1948, and October 25, 1949, at the State Fish Hatchery at Marquette, Michigan, to determine the effect of predation on fin-clipped lake trout, Cristivomer n. namaycush [Walbaum], fingerlings. One experiment involved 4,000 unmarked fish and 4,000 clipped fish confined in the presence of adult brook trout, brown trout, rainbow trout, and lake trout.