These three zooplanktons with higher protein contents are essential for fish larval growth as well as contain a broad spectrum of digestive enzymes such as proteinases, peptidases, amylases, lipases and even cellulase that can serve as exo-enzymes in the gut of the fish larvae. They are the finest and most universally accepted live foods for most fish. Different zooplanktons are being culturing both in laboratory as well as small environments for using in fish and shrimp larvae culture in several countries but no available practice of zooplankton culture in Bangladesh. Normally Artemia are being used in shrimp industries import from Europe and USA as dry cysts