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Water quality monitoring plays an important role in modern intensive fish farming management. In order to improve the efficiency and precision of the data collection procedure, it is necessary to have an automated monitoring system that collects environmental data, especially to record long-term and up-to-the-minute environmental fluctuations. The purpose of this research was to design a remote-controlled, on-line water quality monitoring system for intensive fish culture in China based on wireless communication technology CDMA. Since the long-term detected data provides us with the details of the environmental conditions dynamics of water quality, the system allows us to control the water quality in time and reduce catastrophic losses. The experimental results demonstrate that affordable, large scale, long distance, and long-term monitoring for water quality information can be achieved by using our proposed monitoring system.