The importance of aquaculture is now established, in the context of global food production, aquatic resource management and socio-economic development of rural areas. Advances are being achieved on an increasing scale and development and donor agencies now consider aquaculture to be a priority area. Aquaculture has become a prime subject for research internationally and it is expected to overtake capture as a source of several highly-valued species of fish and shellfish within a decade or so. This work aims to cover all aspects of aquaculture, including all the major species of fish, shellfish and edible seaweed and covers both freshwater and marine aquaculture.