Fish cage system is influenced by various external forces from the ocean environments, and the movements and the deformation of the cage by these external forces affect the safety of the cage itself, as well as that of the cultured organisms. In this research, submersible fish cage was designed to endure less physical stress by harsh sea conditions, and to keep the organisms in safer life by reducing the stress through exposure and movement. The submersible cage system consists of netting, mooring ropes, floating collar, floats, sinkers and anchors. Mass-spring model was used to predict the dynamic response of the cage subjected to tidal currents and waves. Computer simulation was performed for fish cage at the surface and submerged positions to investigate the dynamics of the motion and to calculate mooring line tensions. As expected, the average tension value of the mooring line for the submerged cage were less, being 64% of what we got in the case of surface position under the current velocity of 0.5 m/s combined with the waves. As the waves was used in combination with the current velocity of 1.0 m/s, the average tensile load for the submerged cage showed 85% of the value for the floating cage. The simulation results provide an improved understanding of the dynamic behaviors of the structure and their capability to withstand in subject to sever environmental loadings, and also valuable information on the optimized design of the cage system exposed to the open ocean environmental factors.

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