This manual (the fourth in the series of simple methods of aquaculture) deals with the practical aspects of civil engineering related to freshwater fish culture. In this volume the general features of earthen ponds and fish farms are discussed and advice is given on and advice is given v'' how to select suitable locations. Details of building materials and equipment commonly used in fish farms are also given. Finally, site preparation and the construction of various types of ponds are explained in simple terms. The material in the manual is presented in sequence, beginning with basic definitions. The reader is then led step by step from the easiest instructions and most basic materials to the more difficult and finally the complex the t...