Where in the water column are zooplankton most abundant?

Epipelagic – upper 100 - 200 meters. (light). Much higher zoo plankton biomass We often see a peak in zooplankton concentration just below where the chlorophyl is some zooplankton migrate up and down Mesopelagic – also important for secondary production. A lot of materiall sinking down with little ligt. Twilight zone. Deeper zooplankton lives off of things that fall down or epipelagic species that migrate up and down. We rarely take zooplankton from below 1000 meters.