This study aimed to investigate the catch selectivity characteristics related to the mesh arrangement of the codend in bottom trawl. Sea trials were conducted using the covered codend method from January 16 to 17, 2024, off the southern coast of Gyeongsangnam-do, focusing on the side panels of diamond and square mesh codend. A probit model was used in the selectivity analysis to estimate retention probability curves for sea pike comparing the  , , and  selectivity lengths, the selection range ( ), and the corresponding  and  values. The estimated 50% selection lengths were 23.82 cm for the diamond mesh and 25.20 cm for the square mesh whereas the corresponding selection ranges were 5.23 cm for the diamond mesh and 3.71 cm for the square mesh. The  and  values for the square mesh were lower, at 35.91 and 36.71, respectively, compared to 37.65 and 38.45 for the diamond mesh. Additionally, the retention probability at a fork length of 15 cm was lower for the square mesh than for the diamond mesh. These findings provide practical insights for gear design while contributing to the reduction of bycatch and small size fish catches in bottom trawl.

서 론
재료 및 방법
    시험어구
    시험방법
    망목 선택성 추정 방법
결과 및 고찰
    해상시험 결과
    망목 선택성 곡선의 추정
결 론
사 사
References

• 백세나(국립부경대학교 일반대학원 해양생산관리학부 수산물리학전공 학생) | Sena BAEK (Graduate Student, Department of Marine Production Management major of Fisheries Physics, Pukyong National University, Busan 48513, Korea)
• 김성훈(국립부경대학교 해양생산시스템관리학부 교수) | Seonghun KIM (Professor, Department of Marine Production System Management, Pukyong National University, Busan 48513, Korea)
• 류경진(국립부경대학교 해양생산시스템관리학부 교수) | Kyung-Jin RYU (Professor, Department of Marine Production System Management, Pukyong National University, Busan 48513, Korea)
• 김형석(국립부경대학교 해양생산시스템관리학부 교수) | Hyungseok KIM (Professor, Department of Marine Production System Management, Pukyong National University, Busan 48513, Korea) Corresponding author