Study on a Compound Cage Aquaculture System in an Open Sea

摘要

This study is to develop a new compound cage system that not only maintains benefit of the traditional cage system but also has extra economic value to it by hanging a series of oyster trays on the circumference of the floating collar. The purpose of this study is to investigate the influence of containers of oyster on the traditional cage system in terms of the cage net deformation rate as well as the maximum mooring tension. The numerical results reveal that both cage net deformation rates are about the same, but the mooring tension has reversed effect, i.e., the compound cage system has higher mooring tension than that of traditional cage. Although at normal sea state, the dynamic behaviors of compound cage system is as safe as the traditional one. Special caution should be paid because at 50-year return period design sea state the cage net reduction coefficient reaches as low as 26% such that it may cause fish skin friction with net due to the shrinkage of net cage. Therefore reducing fish density inside the net cage is a must before a serious typhoon attack to avoid fish injury.