This study assessed the effects of mesh-size variation on the size-selective performance and operational characteristics of tie-down gillnets targeting the blackedged sculpin (Gymnocanthus herzensteini) in the East Sea. Four mesh sizes (84, 90, 105, and 120 mm) were evaluated under standardized field conditions, and length-frequency data were analyzed using the SELECT model in conjunction with two relative performance metrics, the catch comparison rate (CCR) and catch ratio (CR). Larger meshes produced selectivity curves shifted toward greater body lengths, and the deformation of the net panels induced by the tie-down structure led to distinctly broad selection ranges. These patterns indicate that retention probability is influenced by both the geometric mesh – body relationship and the mechanical distortion of the netting. Relative efficiency analyses confirmed the superior performance of larger meshes for capturing larger individuals although overall catch declined as mesh size increased. The results clarify the selective properties inherent to tie-down gillnets and provide scientifically grounded information that may support the development of mesh-size regulations, bycatch mitigation approaches, and resource management strategies for coastal gillnet fisheries.

서 론
재료 및 방법
    시험어구
    해상시험
    망목 선택성 곡선 추정
    상대어획효율 분석
결 과
    해상시험 결과
    망목선택성 곡선의 추정
    상대어획효율
고 찰
결 론
References

• 김성훈(국립부경대학교 해양생산시스템관리학부 교수) | Seonghun KIM (Professor, Division of Marine Production System Management, Pukyong National University, Busan, 48513, Republic of Korea) Corresponding author
• 백세나(국립부경대학교 일반대학원 해양생산관리학부 수산물리학전공 대학원생) | Sena BAEK (Graduate Student, Department of Marine Production Management major of Fisheries Physics, Pukyong National University, Busan 48513, Korea)