dynamics of a single point mooring marine aquaculture cage as a simple vibrating system

the increasing world demand for fish cannot be met by capture fisheries. aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. the design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. each design is site-specific and knowledge of the topography, wind force and direction, prevalence of storms or monsoons, wave loads, current velocity and water depths are important parameters for consideration. because of all these reasons the design of an aquaculture cage system is very complex and difficult task. hence, it is essential to select a proper site, ideal construction materials, proper designing, suitable mooring, good management etc. in bringing out a cage culture production more profitable and economical.  a six degree of freedom model is considered to find out the motions and forces acting on the cage. the tensions in the mooring chain and the net twine tension were predicted based on numerical simulation.