In seabream, yolk use was prominent during embryonic development while oil globule use increased post-hatching (Rønnestad et al., 1994).Lake whitefish may follow a similar pattern, as this species hatches with a single large oil globule anterior to the residual yolk (Sreetharan et al., 2015). Whether any of the oil is catabolized during embryonic development is unknown due to the difficultly in estimating the volume of what are numerous small oil globules at fertilization that slowly coalesce into one large oil globule by hatch. The amount of yolk reserves at hatch certainly decreases at colder temperatures, as more yolk is converted to embryonic tissue; indeed, whitefish embryos incubated at 2 °C are much larger with smaller yolks than those at 8 °C (Mueller et al.,2015). Examining how the separate yolk and oil globule components of whitefish are utilized during embryonic development, and if temperature alters such use, is a fruitful area of future research.