In order to clarify the motion characteristics of purse seiner in waves, the motions of an actual purse seiner, 135 GT size, meaｓured during searching for a shoal of fish. The roｌｌing and pitching angles were obtained by using a vertical gyro during a series of trial runs at five headings to the dominant wave direction (C1 to C5) under four sea conditions (S1 to S4). These recorded data were digitised at 0.2 second intervals and analysed by means of statistical and spectrum analysis. Further, we have investigated the seakeeping quality from the safety running point of view. Based on the results, the probability of deck-edge immersion due to roll is also discussed.
