ZooMax 1 oz., Super-Concentrated Zooplankton Suspension for Filter Feeding Invertebrates, Kent Marine. ZooMax is a highly-concentrated suspension of whole bio-engineered marine zooplankton raised in a remote area of the world. Average size is 800 microns, ideal for filter-feeding marine invertebrates as well as planktivorous fish. Extremely rich in essential HUFAs, amino acids, and beneficial biopigments; the only marine zooplankton of its' kind! Properly preserved, contains no alcohol; Requires no refrigeration or freezing!