Human population requires high-quality proteins, vitamins, and minerals for proper nutrition. Fish and vegetables are excellent sources of food groups, for which, there is a need of sustainable technology which efficiently cultivates the food groups while conserving water and land resources. Aquaponics is the ideal of the integrated technology. It is an integration of recirculating aquaculture system and hydroponics. This book, therefore, provides information on aquaponics production of goldfish and spinach with respect to goldfish stocking density and water circulation period. The study should be useful in understanding the system and help to start your own aquaponics system.