Aquaculture is the production of algae and animals whose main purpose is the production of food for human consumption. This paper gives an overview of the aquaculture production, with particular emphasis on the cultivation of zooplankton and its importance in the process of freshwater fish farming. Fish farming can take place in several ways: in cages, ponds, raceways and recirculating systems. The zooplankton as source of nutrients for larval and early juvenile stages of fish, has a key role in aquaculture. Rotifera, Cladocera and Copepoda make the majority of freshwater zooplankton, and their cultivation can be serial, semi-continuous and continuous. The high growth rate of Rotifera (e.g. Brachionus plicatilis) and Cladocera (e.g. Artemia salina), enables them development of abundant population, making them the most desirable food form for younger fish. Copepods, while having great nutritional value but a low rate of growth, are less represented. The richness in protein and unsaturated fatty acids, makes the fish and other aquatic organisms one of the best form of nutrition. Which means that in the future more attention should be paid to sustainable aquaculture.