Crustacean is the class of phylum"‟ Consistingthree majorgroups Arthropods of zooplankton, Copepods, Cladocera i.e. and Ostracoda. They are tiny aquatic animals and playskeyrole in afoodchain of fishes. They mostly feed on metazoans, small unicellular plantsandanimals especially othercrustaceansaswellasorgan debris. Planktonic copepodshave high: nutritive value because of their protein content (Altaff and Chandran, 1989) of essential amino acids (Krauletal., 1993) which greatly enhance their value the U.S. live feed in aquaculture. From the ecological pointof viewcladoceraisa crucialgroup among zooplanktoncommunity. Ostracods have a ubiquitousdistribution, highdiversity of life history strategies. These characteristics makethegroup useful study toolinmultipledisciplines. Themoststable
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