It could be because they display a horizontal diurnal migration
pattern like some hydro- and scyphomedusae (Hamner and Hauri, 1981; Arkett, 1989; Hamner et al.
The fish, in their turn, carried out the opposite diurnal migration
, feeding in the surface layers in the mornings and moving to intermediate depths later in the day and at night.
Vertical distribution and diurnal migration
patterns of Jasus edwardsii phyllosomas off the east coast of the North Island, New Zealand.
of plankton in the Gulf of Maine and its correlation with changes in submarine irradiation.