Traditionally, sea cucumber production relies heavily on human labors which results in low production efficiency and inability to meet the demands of a rapidly growing market. To address this problem, this paper brings the idea of cyber physical systems (CPS) into aquatic areas. This paper provide a detailed analysis of the theory and characteristics of CPS along with its practical significance, and construct a physical information fusion system for sea cucumber production. The system is designed according to the CPS architecture, which includes the environmental monitoring subsystem, the information processing and transmission subsystem, the process control subsystem and the remote control center. In accordance with the characteristics of interaction between physics and information, this paper models and verifies the physical process by using the theory of automata, which ensures the reliability of the overall system. The deployment of the main parts of the system has been completed. The observation data indicates that, the system can be used to effectively monitor sea cucumber production. The system also has good scalability. Through in-depth cooperation with experts in the field, we believe it can be extended to be used in many other applications in water environment.