One 16oz bottle of Nannochloropsis Phytoplankton. I've been brewing this strain for the last year in a half and it is live food that many marine animals feed on Clams, Scallops, Feather dusters, Coco Worms, SPS, LPS, Soft Corals, Pods, Copepods, Amphipods, Sea fans, Shrimp larvae, Rotifers, Brine shrimp, any kind of filter feeder, and many more.