The word plankton was first of coined by Henson, which means that which drifts. A single organism in the plankton is known as a plankter. The wide distribution of many plankton species is one of the most striking features encountered in the study of planktonology. Some articles in the book clearly reveal the fact that the plankton is regarded as a best biotool. The book entitled Ecology of Plankton has been written covering applied aspects of Limnology in order to cater to the needs of students, research scholars and teachers in college and university. A book of this kind will be of immense use to all those who study or teach aquatic ecology and hydrobiology. Not only this, the present book will also be helpful for students, research scholars, professors, scientists as well as for limnologists for aquatic impact assessment and management.'