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The scallop culture fishing is a malor fishing in Uchizara − B の ノ ， Hoflflaido ， ノ 砂 砌 ， and many small fishing boats are engaging in the fishing ． As small fishing boats during fishing operation conditions generally incline from 6 to 10 degrees due to moQring to the culture facilities ， it is vital for preventing the capsize to make clear roll motion during fishing operation conditions ， especially for the difference ofencounter − ed angle of waves ， Considering easiness of working on the fishing operation ， most fishermen moor the ship to be encountered tides from her left side ． We carried Qut tank tests and measurements by using afull ・ scale ship to verify the effect for the roll response during these mooring method ぎ． Based on the rol ！response function and the characteristics of power spectrum generated in 乙 励 iura − Bay， we est 至 mated roll motion experienced in real sea and discussed the safety directions of encountered waves during the fishing operat ｛ ons ・ Japan 工nstitute of Navigation 124

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