In the previous study, a shooting trajectory assuming that the purse seine shooting trajectory is a circle was proposed based on the speed and direction of the movement of the fish school. However, in practice, a trajectory that is closer to an elliptical shape than a circular one is often formed. In this study, the existing circular trajectory and the elliptical trajectory methods were compared under the same conditions to confirm the effectiveness of elliptical shooting trajectory. In addition, changes in the eccentricity of ellipses were derived to assess which type of ellipse was appropriate as a shooting trajectory. When a high-speed fish school moves in a straight line, an elliptical shooting trajectory with the eccentricity of 0.7 to 0.9 will be reasonable, and for middle-low speed fish school, an elliptical shooting trajectory with the eccentricity of 0.4 to 0.6 will be more useful than a circle shooting trajectory.

서 론
재료 및 방법
    선망그물의 사양
    원형 투망궤적
    타원형 투망궤적
    연구 방법
결과 및 고찰
    타원의 형태
    타원의 방정식
    그물 중심부의 발줄 침강 속도와 침강 깊이
    어군의 속도에 따른 분석
    어군의 허용 반경
고 찰
결 론
References

• 이다윤(부경대학교 수산물리학과) | Da-Yun LEE (Department of Fisheries Physics, Pukyong National University)
• 이춘우(부경대학교 해양생산시스템관리학부) | Chun-Woo LEE (Division of Marine Production System Management, Pukyong National University) Corresponding author
• 최규석(부경대학교 수산물리학과) | Kyusuk CHOI (Department of Fisheries Physics, Pukyong National University)
• 장용석(부경대학교 수산물리학과) | Yongsuk JANG (Department of Fisheries Physics, Pukyong National University)