This pack includes 3 16oz bottles of our Copepod and Rotifer zooplankton blend and an 8 oz bottle of high concentration phytoplankton blend to feed them. This pack is perfect for culturing your own zooplankton, which will multiply feeding on the phytoplankton provided. There is enough zooplankton to start a culture and a backup culture if needed. To read more about this check out Culture your own Copepods.