The branch of ecology which studies the interactions between various organisms which dwell in water bodies, and their surroundings, is known as aquatic ecology. The different aquatic environments which fall under the domain of aquatic ecology are estuaries, lakes, ponds, oceans and rivers. An ecosystem which exists in a body of water is known as an aquatic ecosystem. There are primarily two types of aquatic ecosystems, marine and freshwater ecosystems. Marine ecosystems are further divided into various zones like oceanic zone, benthic zone and intertidal zone. Freshwater ecosystems are broadly divided into three types - lentic, lotic and wetlands. Lentic ecosystems are made up of slow moving water. Lotic ecosystems consist of faster moving water, such as streams and rivers. Wetlands are ecosystems which are flooded by water, either seasonally or permanently. This book provides comprehensive insights into the field of aquatic ecology. The topics included herein on this subject are of utmost significance and bound to provide incredible insights to readers. Those in search of information to further their knowledge will be greatly assisted by this book.