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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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A study on the mesh size selectivity by alternate haul method of trawl using the SELECT model

SELECT 모델을 이용한 트롤 비교 시험조업법에 의한 망목 선택성에 관한 연구

  • Seonghun KIM (Department of Marine Production System Management, Pukyong National University) ;
  • Hyungseok KIM (Department of Marine Production System Management, Pukyong National University) ;
  • Sena BAEK (Department of Fisheries Physics, Pukyong National University) ;
  • Jaehyung KIM (Department of Fisheries Physics, Pukyong National University) ;
  • Pyungkwan KIM (Fisheries Engineering Research Division, National Institute of Fisheries Science)
  • 김성훈 (부경대학교 해양생산시스템관리학부) ;
  • 김형석 (부경대학교 해양생산시스템관리학부) ;
  • 백세나 (부경대학교 대학원 수산물리학과) ;
  • 김재형 (부경대학교 대학원 수산물리학과) ;
  • 김병관 (국립수산과학원 수산공학과)
  • Received : 2023.01.31
  • Accepted : 2023.04.25
  • Published : 2023.05.31
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Abstract

In this study, a comparative test operation was conducted through the alternate haul method to examine the selectivity of the four mesh sizes (60 mm, 90 mm, 110 mm, and 130 mm) of the trawl codend. The selectivity was analyzed using the SELECT model considering the fishing efficiency (split parameter) of each fishing gear in the comparative test fishing operation in the trawl and the maximum likelihood method for parameter estimation. A selectivity master curve was estimated for several mesh sizes using the extended-SELECT model. As a result of analyzing the selectivity for silver croaker based on the results of three times hauls for each experimental gear, it was found that the size of the fish caught increased as the size of the mesh size increased. When the selectivity for each mesh size analyzed by the SELECT model considering the split ratio was evaluated based on the size of the AIC value, the estimated split model was superior to the equal split model. Based on the master curve, the 50% selection length value was 2.893, which was estimated to be 136 mm based on the mesh size of 60 mm. In some selectivity models, there was a large deviance between observed and theoretical values due to the non-uniformity of the distribution of fished length classes. As a result, it is considered that appropriate sea trials and selectivity evaluation methods with high reliability should be applied to present trawl fishery resource management methods.

Keywords

Acknowledgement

본 연구는 국립수산과학원 수산시험연구사업(R2023008)의 지원에 의해 수행되었습니다.

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