CONTROL OF LAKE TROUT REPRODUCTION - ROLE OF LIPIDS

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.