Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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An experimental study on the size selectivity of fusiform fish by the netting characteristics

망지 특성에 따른 방추형 어류의 크기 선택성에 대한 실험적 연구

  • Sena BAEK (Department of Fisheries Physics, Pukyong National University) ;
  • Hyungseok KIM (Division of Marine Production System Management, Pukyong National University) ;
  • Kyung-Jin RYU (Pukyong National University) ;
  • Seonghun KIM (Division of Marine Production System Management, Pukyong National University)
  • 백세나 (부경대학교 대학원 수산물리학과) ;
  • 김형석 (부경대학교 실습선) ;
  • 류경진 (부경대학교 해양생산시스템관리학부) ;
  • 김성훈 (부경대학교 실습선)
  • Received : 2023.07.05
  • Accepted : 2023.08.24
  • Published : 2023.08.31
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Abstract

This study quantitatively evaluated size selectivity for three netting shapes (T0; regular, T45, T90) and hanging ratio (35%, 70%) of T0 netting used for trawl codend. The size selectivity experiment was performed in a tank using a cube experimental model with a length of 50 cm on one side and 389 experimental individuals, jack mackerel (Trachurus japonicus). In the selectivity analysis, a selectivity curve was created based on the selection ratio using a logistic function, and the 25%, 50%, and 70% selection length and selection range (SR) were obtained. The T0 netting was 19.54 cm when the 50% selective length, which is a selectivity evaluation index, had a hanging ratio of 35%, a selection range of 0.51 cm, and 22.70 cm and 3.08 cm for the hanging ratio of 70%. The T45 netting was 24.34 cm and 2.13 cm, and the T90 netting was 23.51 cm and 2.84 cm. The results of the T45 netting and the T90 netting are similar, and the 50% selection length and selection range were relatively larger than the T0 netting. There was a significant difference in the correlation between the circumference of the inner circle of the mesh by the shape of the netting and the body girth of the experimental individual (Pearson test, r = 0.86, p < 0.05). There was no significant difference in the correlation between the selection ratio by the T0 netting, T45 netting, and T90 netting with a 70% hanging ratio (one-way ANOVA, p > 0.05). The results of this study showed that selectivity such as T45 netting and T90 netting appeared when the hanging ratio, which maximizes the area of T0 netting, was maintained at 70%.

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Acknowledgement

이 논문은 2023년도 해양수산부 재원으로 해양수산과학기술진흥원(KIMST)의 지원을 받아 수행된 연구입니다(20210549, 전기복합 추진어선의 검증 및 실용화를 위한 기술개발과 체계구축).

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