G.F.A Advanced System Ltd. has developed, implemented and operates a unique fully closed, zero discharge intensive aquaculture system that is suitable both for fresh and sea water fish. The system is based on an extensive research done by Prof. Jaap van Rijn of the Hebrew University of Jerusalem. The system prevents environmental pollution, and can operate in any climate regardless of the availability of water resource or proximity to the sea. The system has been tested and proven on a scientific basis and is now operated commercially.