 Migration patterns vary between different species, size groups, life history stages, sex, latitude, time and season.These fish exhibit a daily migration pattern.During the day they concentrate between 400–1000 m. During the night, they migrate close to the surface between 5–100 m. These diel vertical migrations are primarily performed because zooplankton, their main food, is concentrated in the upper layers, while they need to go deep during the day in order to avoid predators.