All the water bodies on Earth have an aquatic ecosystem and an aquatic ecology. It consists of all the under-water plants, animals, etc. Aquatic ecology can be divided into two main parts namely freshwater ecosystem and marine ecosystem. This book is a valuable compilation of topics, ranging from the basic to the most complex discoveries and principles in the field of aquatic ecology. The topics included in it are of utmost significance and bound to provide incredible insights to readers. Those with an interest in the subject of aquatic ecology would find this textbook helpful.