Study on a Fixed Net Fishing Vessel (19 GT Type)

Abstract

The fixed net fishery is essential, because the quantity of catch is the second in Japan. And it is said that this fishery consumes very little oil and is friendly to the ocean environment. But researching fixed net fishing vessels has not been done at all for a long time. Under these backgrounds, study on a fixed net fishing vessel is carried out. Subjects on a vessel are cleared through field survey, so that hull form, hull construction, the difference of loading conditions and sea speed at between departing from the port and the fixed net and so on. Improving hull form is tried to 19 gross ton type, and the performance is evaluated through a model resistance test in a circulating water channel (cwc). The hull form design for fore body is improved by the use of wave making resistance theory, and one for aft body is enhanced by the use of the Eulerian scheme with the Lagrangian particles. The fixed net fishing vessel is defined as low fuel consumption. But the level of hull resistance is not very good, so the fact is cleared of that improving of hull form and decrease speed is necessary for saving energy and for getting up profit. Through present study, the truth is cleared that the cwc experiments are very useful for inducing the projects on developing hull form and there is the difference of view point to cwc experiments on between general merchant ships and special small ships including fishing vessels.