Contents: 1. Estuaries of India: An overview/Kailash Chandra, C. Raghunathan, Swetapadma Dash, Tamal Mondal and Smitanjali Choudhury. 2. Phytoplankton/C. Raghunathan and M.P. Goutham Bharathi. 3. Mangrove in Indian estuaries/M.P. Goutham Bharathi, C. Raghunathan and Kailash Chandra. 4.Protozoans/Sudhanshu Dixit and Tamal Mondal. 5. Foraminiferans/M.P. Goutham Bharathi, Smitanjali Choudhury and C. Raghunathan. 6. Sponges/Preeti Pereira and C. Raghunathan. 7. Cnidarians/Smitanjali Choudhury, C. Raghunathan and Kailash Chandra. 8. Ctenophores/C. Raghunathan and Smitanjali Choudhury. 9. Rotifers/S. Kumaralingam, Preeti Pereira and Tamal Mondal. 10. Nematoes/Sudhanshu Dixit and C.Raghunathan. 11. Acanthocephalan/Tamal Mondal and Jhimli Mondal. 12. Sipuncula/Tamal Mondal and Jhimli Mondal. 13. Molluscs/V. Raghunathan, Oishinee Chakraborty, Sudhanshu Dixit and R. Kayal Vizhi. 14. Annelids/Naveen Kumar Nigam, Sudhanshu Dixit, S. Kumaralingam and C. Raghunathan. 15. Arthropds/Kailash Chandra, C. Raghunathan, Swetapadma Dash, S. Kumaralingam and Sepana Rajendra. 16. Bryozoans/M.P Gouthan Bharathi and C. Raghunathan. 17.Brachiopods/C. Raghanthan and Oishinee Chakraborty. 18. Chaetognatha/Oishinee Chakraborty, S. Kumaralingam and C. Raghunathan. 19. Echinoderms/Naveen Kumar Nigam and C. Raghunathan. 20. Hemichordata/Tamal Mondal and Jhimli Mondal. 21. Tunicates/Jhimli Mondal , Tamal Mondal and C. Raghunathan. 22. Fishes/Seepana Rajendra, Swetapadma Dash and C.Raghunathan. 23. Amphibians/Kailash Chandra and S. Rajeshkumar. 24. Reptiles/Kailash Chandra and S. Rajeshkumar. 25. Birds/S. Rajeshkumar and Kailash Chandra. 26. Mammals/S.Rajeshkumar, Swetapadma Dash, C. Raghunathan and Kailash Chandra. 27. Threats to Indian estuaries.