Abstract
Eggs of lake trout (Salvelinus namaycush) were incubated during 1984-1985 and 1985-1986 in chilled water that decreased in temperature from 41.5°F in November to 38.7°F in January and then increased to 45.9°F in February. Ambient water temperatures varied from 51°F in November to 47°F in February. The mean survival (range in parentheses) from fertilization through hatching to a size of 2,500 fish/lb was 54% (49-59%) in chilled water and 18% (12-21%) in ambient-temperature water. Chilled water enhanced the survival of lake trout of both the Lake Ontario and the Seneca Lake strains.