A review on the sinking performance and numerical simulation of fishing gear

A new type of fishing gear, the light falling-net, has rapid development in the South China Sea in recent years. Sinking performances and shape of the nets in working are the important factors influencing fishing efficiency. This paper summarized factors affecting the sinking performances of fishing gear, including leadline load, net material, hanging ratio and ocean current, etc. Moreover, the studies on hydrodynamic coefficient and characteristics of mesh bar, and the methods for establishing dynamic mathematical model of fishing gear have become another focus in this paper. By analyzing the methods and results of longline, netting and purse seine concerning numerical simulation, a resistance formula featuring light falling-net could be built, taking advantage of CN90 formula by Friedman and C0 formula by Matuda and plane netting resistance coefficient of arbitrary attack angle by Tauti. It was suggested that the matrixing network and distributed computing could be used to solve the formula of different mass points in order to obtain a stable calculation time-step in numerical simulation.