El-Nenaeia Company has developed a commercial fish production demonstration utilizing water recycle technology developed at Banha University, Faculty of Agriculture, Agricultural Engineering Department. The fish production system is designed in a 32.0 m long by 12.0 m wide. Fish production activities began in the spring of 1998. The facility is designed to produce 30 tons of fish annually, with the first crop being tilapia. The project is being operated as a public demonstration of this technology, with biological, engineering and economic data being collected by research personnel at El- Nenaeia Company. This paper outlines the design of the recirculating system technology used to recycle water through the main fish production tanks.