In a field study, the burbot (Lota lota) larvae
started to feed on zooplankton 5 days after hatching;
of 25 burbot larvae, only two larvae contained zooplankton
prey in their stomach at the first feeding28.
These authors indicated that the first food items taken
by burbot larvae were rotifers. Also in a laboratory
study, the larvae first ate phytoplankton and did not
switch to copepod nauplii until the third day of exogenous
feeding