The two photos show a model of phytoplankton and rotifer production as required for the reproduction of marine fish species. This unit has been placed in Bandar Emam Research Station, Iran.
As shown in the photos, each unit of the tanks has two compartments at two levels. The 300-liter upper compartment is used for phytoplankton production while the 4-m3 lower compartment is used for rotifer production. The stocking density in both tanks (phytoplankton and rotifers) should be compatible to ensure an effective combination.