Abstract
Lots of small fishing boats for the raising of scallop on the coastal area in Funka-Bay, Hokkaido have been sometimes compelled to work under the sever sea condition since it is actually main producing season in winter. So there should be great needs of sufficient seakeeping quality to secure a safety during the fishing operation. On basis of tank tests and researches of actual fishing operating condition, it is clarified the stability and rolling response characteristics of the fishing boats in various working conditions. In this paper, using wave data measured in fishing ground, the authors would propose the critical wave height that these fishing boats could be on the sea with safety. The results are obtained as follows ; (1) As the scallop would load on the deck from 0 to 5ton, the value of rolling response function would slightly increase. (2) As ship body would fix to the main rope of the raising facilities, the rolling responses would force little. Furthermore, the rolling motion to the mooring direction would become bigger than that to the opposite direction. (3) On the condition using the hydraulic crane, the rolling responses would fairly increase. (4) From the viewpoint of safety for all considerable conditions of the fishing operations, it would be estimated the significant wave height H_<1/3> that the fishing boats could do fishing is 1m.
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