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Finite element analysis (FEA) is used to predict the dynamic performance of an offshore fish cage and submerged moorinq grid system. The system kas been deployed at an exposed demonstration site in 55 meters of uxuer south of the Isles ofShoals, New Hampshire. Computer simulations were performed to investigate the dynamics of the cage motion and to calculate moorinq line tensions. The results were used to establish the baseline design specifications and to evaluate the ooeraü performance of the system.Both surface and submerqed positions of the net pen are considered. It is shoum that the extreme environmentalloading conditions at the demonstration site produce 60%less mooring tension in the case of a submerged cage. According to the analysis, the case uihen one offour mooring legs becomes disabled will not produce the failure of the mooring system.The problem. of adequate modeling of net is addressed. A simple technique is proposed to approximate the effect of netting on the overall dynamic response offish cage/ mooring systems.

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