The factors governing life on earth are changing constantly and the same is true for life too. The unique property of the aquatic insects is their ability to changes in the themselves, accepting the challenge caused by changes in the surroundings and this has enabled to exploit the environment successfully, leading to their survival multiplication and continuation on earth since first appearance. This book is the compilation of esteemed articles of internationally acknowledged experts in the field of aquatic biology with the intention of providing a sufficient depth of the subject to satisfy the needs at a level which will be comprehensive and interesting. The present book will be useful to the students, research scholars, scientists in the field of Environmental management and ecoplanners, politicians and other people with similar interest.'