Somatic lipid density of lake trout decreased during summer and increa
sed after spawning in October, peaking April, prior to ovarian recrude
scence. Non-lipid density increased from June or July until August and
remained relatively constant until March. All lake trout (n=30) reare
d on high (n=10, 0.4%), medium (n=10, 0.15%) and low (n=10, 0.05%) rat
ions from March to September spawned. In a second experiment for which
the treatments commenced in November, the proportion of females matur
ing in the following October (high=88%, medium=69%, low=28%) was posit
ively related to ration levels. (C) 1998 The Fisheries Society of the
British Isles.