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 application of escape device in a net pot for protecting of small giant octopus (Octopus dofleini)

어린 대문어(Octopus dofleini) 보호를 위한 통발의 탈출장치 적용에 대한 실험적 고찰

  • KIM, Seonghun (Department of Marine Production System Management, Pukyong National University)
  • 김성훈 (부경대학교 해양생산시스템관리학부)
  • Received : 2022.07.05
  • Accepted : 2022.07.29
  • Published : 2022.08.31
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Abstract

In this study, for the purpose of reducing the catch of small giant octopus in a net pot, an escape experiment of octopus was performed on five types of escape rings of different sizes. As a result of the experiment, the smallest giant octopus with a weight of 406 g was found to escape from an escape ring with a diameter of 30 mm or larger, and 592 g octopus, a weight similar to the octopus of the current minimum landing weight (600 g), escaped from an escape ring with a diameter of larger than 40 mm. An individual weight with 406 g becomes 39 mm when converted from a diameter of 25 mm circular escape vent; that is, the circumference to the inner diameter of the mesh. It can be inferred that the converted mesh size of 39 mm cannot escape. Logistic regression analysis was performed using a generalized linear model (GLM) to investigate the correlation between the ratio of escape ring size/Mantle diameter (R/MD) and the escape rate. As a result, it was found that there was a significant correlation between the R/MD ratio and the escape rate and that the higher the R/MD ratio, the greater the escape rate. As a result of logistic regression analysis, the R/MD value was denoted 0.520 with the 50% escape rate. In addition, it can be estimated to be about 50 mm when converted to the mesh size. Therefore, in this study, the diameter of the escape ring and the size of the escape possible of the octopus were experimentally considered. It was found that there was a significant correlation.

Keywords

Acknowledgement

본 논문은 부경대학교 자율창의학술연구비(2021년, CD2021797)에 의하여 연구되었음.

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