In this study, the conventional cylinder-shaped lower bar on the canvas was modified and its performance was tested to improve the opening force of the stow net on anchor. The improved new lower bar used in the test is consisted of 13 flat bars with a length of 1.8 m, a width of 0.075 m and a thickness of 4 mm, and a pipe with a length of 2.0 m and a diameter of 50 mm. A stow net with the improved lower bar and a stow net with an existing lower bar were installed underwater and their trajectories for 21 hours were examined. To confirm their trajectories, GPS loggers were attached to the buoys on the left and right canvases and the buoy of the hauling rope. As a result of the test, the rotation of the gear with the improved bar was smoother than that with the existing bar. As a result of comparing the changes in the interval of the buoys attached to the canvas after the low and high tide, the buoy spacing of the gear with the improved bar is wider than that of the conventional gear; moreover, the larger the interval, the smoother the rotation of the fishing gear was. Therefore, it is considered that using the improved lower bar can enhance the performance of the stow net.

• 구명성(남해수산연구소 자원환경과) | Myeong-Seong KOO (Fisheries resource and environment Division, South Sea Fisheries Research Institute, NIFS)
• 정성재(동해수산연구소 자원환경과) | Seong-Jae JUNG (Fisheries resource and environment Division, East Sea Fisheries Research Institute, NIFS)
• 차봉진(남해수산연구소 자원환경과) | Bong-Jin CHA (Fisheries resource and environment Division, South Sea Fisheries Research Institute, NIFS)
• 김인옥(국립수산과학원 수산공학과) | In-Ok KIM (Fisheries Engineering Division, NIFS)
• 조삼광(국립수산과학원 연구협력과) | Sam-Kwang CHO (Research cooperation Division, NIFS)
• 이건호(서해수산연구소 자원환경과) | Gun-Ho LEE (Fisheries resource and environment Division, West Sea Fisheries Research Institute, NIFS) Corresponding author