抄録
Small fishing boats less than 20 GT, which account for over 99% of fishing vessel in Japan, are constructed in accordance with several safety regulations. However, there are many capsizing accidents of Japanese fishing boats every year. In order to decrease capsizing accidents, fishermen should know the safety margin of their own boats. It is actually difficult to perceive quantitatively the safety margin of a small fishing boat, mainly because such boat's condition differs significantly from day to day. A fisherman should know GM (transverse metacentric height) of his boat as a most basic thing to grasp the boat safety. It is possible to work out GM from the boat's rolling period, if the radius of gyration of the boat is known already. We performed rolling tests for the small fishing boats, belonging to the Aba fisheries cooperative association in Nagasaki City and engaged in ribbonfish trolling, and studied the safety by applying the small fishing vessel safety regulation (hereinafter, SFV-reg.) to the test boats. We also conducted questionnaires to fishermen, to get an idea about safe operation. As a result, every test boat implemented the SFV-reg., although there were differences of conditions among the test boats. It, however, was found that the rolling periods or GMs of the test boats changed significantly because the conditions of the boats varied according to the amount of fuel loaded. Toward the safe navigation and operation in the future, a ribbonfish trolling boat is required to load enough fuel and to make sufficient pre sailing check including measurement of rolling period to estimate GM.
