Abstract
Crustacean fauna constitutes prawn, crab, shrimps, wood lice, fish lice, barnacles and lobsters. Majority of them are aquatic, and breathe through gills or general surface of the body. Decapoda is a highly evolved and the largest order of Crustacea with about 8500 species. Culture of prawn and crabs in India have gained much importance in the recent years both for domestic consumption and also for export. Families Palaemonidae and Potamonidae constitute major fisheries of India. Majority of them are marine forms with cylindrical body. Segmentation of the body is conspicuous except in smaller forms. They are characterised by two pairs of antennae of which one pair is called antennules. Important contributions on freshwater decapods were by Chopra (1930), Chopra and Tiwari (1947), Ramakrishna (1950), Tiwari (1955), Vasisht and Singh (1972), Ghosh et al. (1993), Ghosh (2000), and, Ghosh and Ghatak (2000).
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