Grazing pressure, varying with depth, must play a role in shaping the general form of the chlorophyll profile which often contains a deep chlorophyll maximum (DCM). Until we obtain enough coincident high-precision profiles of chlorophyll and grazing plankton (such as the BATFISH profiles, discussed below) it is difficult to be sure that this is so, though the problem is important enough to warrant an attempt, and several have been made....
Longhurst, Alan R., and Alex W. Herman. 1981. "Do oceanic zooplankton aggregate at, or near, the deep chlorophyll maximum?." Journal of Marine Research 39, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1548