This module provides an introduction to and importance of aquaculture in the different parts of the world. It gives overview of the organisms used in aquaculture, the methods of site selection and preparation as well as production of aquatic organisms in a controlled and managed way. As the methods of aquaculture differ for each group of organism, the different groups of invertebrates, algae and fishes are treated separately. The module also discusses the potential positive and negative impacts that aquaculture may cause on the environment. Integrated farming practices where fish are cultured with other plants or animals are discussed. Particular focus is placed on integrated culture practices that Ethiopian farmers can easily adopt. Administrative, policy, governance and management issues are also explained as these are keys to successful implementation of aquaculture in any given country. It also deals with aspects of the applications of fisheries science pertaining to production, exploitation, and management of fisheries resources and the environment towards obtaining sustained societal benefits. It will discuss fish growth, mortality, recruitment, and fish stock assessment models.