This book on “Endocrine glands of the fish, Notopterus notopterus“ is written keeping in view the methodology being adopted for endocrine studies in a particular fish and this complete manuscript is a outcome of over 30 years teaching and research experience for post-graduate and research students. A comprehensive account of a particular fish species on endocrine glands is not easily available and this book can help young researchers carrying research work on comparative endocrinology and more specifically with reference to fish endocrinology and reproduction. It is hoped that the methodology given in this book may help and inspire students joining research in the field of fish endocrinology and related research.