The scientific study of the interactions of organisms with each other and with their environment is referred to as ecology. It also includes the relationships between individuals of the same species, between different species, and between organisms and their physical and chemical environments. Aquatic ecology focuses on the study of plants and animals as well as these relationships in the aquatic environments such as oceans, estuaries, lakes, ponds, wetlands, rivers and streams. The physical characteristics of an aquatic habitat affect the kind of organisms that are present there. Living organisms found in a particular ecosystem are directly affected by environmental characteristics such as nutrient concentrations, temperature, water flow and shelter. This book outlines the processes and applications of aquatic ecology in detail. There has been rapid progress in this field and its environmental applications are finding their way across multiple industries. Scientists and students actively engaged in aquatic ecology will find this book full of crucial and unexplored concepts.