From college and university students, to researchers, policy makers, managers and also nature lovers of the country and abroad, the book fulfills their long awaited demands for a publication which combines all the existing and new, updated research in an engaging way, making reading and understand more interesting. Consisting of 260 pages, the book has numerous graphics and diagrammatic illustrations, colored photo plates and maps, providing a knowledge bank on ecology, fisheries and mankind effects on Indian estuaries. Starting from definition of estuary, process of formation and classification of estuaries on the basis of salinity and climatic conditions, the book goes on to cover more complex aspects such as circulation, sedimentation, residence time and stratification in estuaries. Physio-chemical and biological properties have been discussed in general along with food-web observed in the estuaries. Resource potential of different Geo-Climatic zones has been described with diagrammatic presentation of important estuaries wherever possible. Apart from several biological, ecological and other factors affecting fisheries and estuaries, management issues for estuaries have also been dealt with in the publication. Resource conservation, policies and planning have elaborate presentations along with examples and cases studies from various countries of the world. The book satisfies all technical, managerial and geographical questions from the curious mind.