From the foreword: `The Zoological Survey of India, after an interval of 60 years since the last report of Chilka was published initiated an extensive survey on Chilka lake for a period of 3 years from 1985-1987. The present volume contains the findings of the investigation and one can compare the faunal resources recorded at an interval of 60 years. In most of the cases the document reveals biodiversity at species level still appears very rich, even though the physico-chemical and limnological characteristics have significantly changed between 1925 to 1985.'