The problem of the dynamic behaviour of a floating fish habitat by ocean waves is investigated theoretically in this paper. A mathematical model for determing the dynamic displacement of a aquaculture are derived by using a empirical relationship of wave force acting on the plain net. The culclations resits arecompared with the wave tank tests under various wave conditions and they show good agreement. Also, a new field measurement system of the movement of fish farm structure is developed and results of laboratory tests of the system are presented.