Abstract
In Japan, the marine aquaculture net cage has an important role in farming pacific bluefin tuna farming in oceans, and the design of the net cage needs to ensure robustness against hostile oceanic conditions. Accordingly, this study focuses on the drag forces and the cage volume of the net cage, and on their variations induced by different design parameters (netting solidity ratio, netting height, and bottom weight). A series of parametric studies on drag force and deformation of the net cage was conducted using a numerical simulation model. Accordingly, the contribution of each parameter to the drag and volume was analyzed using a generalized additive model. The results indicate that the bottom weight had the highest contribution to the holding ratio of the cage volume, whereas the netting height had the highest contribution to the drag coefficient of the net cage. Finally, a fast prediction model was created by a backpropagation (BP) neural network model and was examined for the accurate prediction of the objective variables.
Highlights
In Japan, pacific bluefin tuna (Thunnus orientalis) farming has attracted attention as a promising business and has continued to grow [1]
Offshore fish farming with the use of the aquaculture net cage has been increasing owing to the problem of near-shore water pollution
The analyses of the deformations and drag forces of the net cages is the basis for the optimization of the design and safe use of the net cage system
Summary
In Japan, pacific bluefin tuna (Thunnus orientalis) farming has attracted attention as a promising business and has continued to grow [1]. The floating rope and HDPE (high-density polyethylene) floating collars net cage play important roles in farming tuna. Strong ocean currents and waves make it easy to deform, and cause problems, such as damage and slow growth of pacific bluefin tuna. Fu et al [2] conducted a model experiment to determine the cage volume and tension in the mooring line with the use of different mooring methods. Lader et al [3] used a circular net cage made of nylon to clarify the drag force and volume by changing the bottom weight and current speed. Huang et al [4,5,6] examined the volume change and the tension on the mooring line of the gravity-type net cage based on model testing
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