Trawl fishing is a fishing method in which a large, motorized trawler tows a bag-shaped net to catch fish living at the bottom or middle layers. For a trawl gear, it is of utmost importance to select the gear size and towing speed suitable for the effective horsepower (EHP) of the trawler in the design stage. In general, the power required to move an object is proportional to the product of the object speed and resistance; therefore, there are various choices for the gear resistance and towing speed given the effective horsepower of the trawler. However, there have been few studies on the gear design of an appropriate scale for the towing speed given the effective horsepower of the trawler. In this study, the resistance and shape of three types of midwater trawl gears were analyzed using SimuTrawl, a computer simulation tool. In addition, the relationship between the propulsion force and speed of the ship was clarified when the size and effective horsepower of the trawler were determined. Finally, we suggested the relationship between the towing speed and the resistance of the gear when the trawler towed the net was investigated, and a specific method of selecting the gear size according to the towing speed.

서 론
재료 및 방법
    트롤선 및 트롤 어구 선정
    어구 거동 해석 모델
    예망 중 트롤선의 운동방정식
결과 및 고찰
    트롤 어구의 거동 해석
    유효 마력에 따른 트롤선 속도
    예망 중 어선 속도로부터 어구 규모 추정
결 론
References

• 이춘우(부경대학교 해양생산시스템관리학부) | Chun-Woo LEE (Department of Marine Production System Management, Pukyong National University) Corresponding author
• 최규석(부경대학교 수산물리학과) | Kyu-Suk CHOI (Department of Fisheries Physics & system, Pukyong National University)
• 장용석(부경대학교 수산물리학과) | Yong-Suk JANG (Department of Fisheries Physics & system, Pukyong National University)