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 change of the depth and catch of hairtail trolling lines

갈치 끌낚시 어구의 수심변화 및 어획량 시험

  • KIM, Mun-Kwan (Ocean and Fisheries Researches Institute, Jeju Special Self-Governing Provence) ;
  • PARK, Su-Hyeon (Ocean and Fisheries Researches Institute, Jeju Special Self-Governing Provence) ;
  • KANG, Hyeong-Cheol (Ocean and Fisheries Researches Institute, Jeju Special Self-Governing Provence) ;
  • PARK, Yong-Seok (Ocean and Fisheries Researches Institute, Jeju Special Self-Governing Provence) ;
  • AN, Young-Il (Dept. of Maritime Police and Technology, Gangwon State University) ;
  • LEE, Chun-Woo (Div. of Marine production System management, Pukyong National University) ;
  • PARK, Su-Bong (Institute of Low-Carbon Marine Production Technology, Pukyong National University)
  • 김문관 (제주특별자치도 해양수산연구원) ;
  • 박수현 (제주특별자치도 해양수산연구원) ;
  • 강형철 (제주특별자치도 해양수산연구원) ;
  • 박용석 (제주특별자치도 해양수산연구원) ;
  • 안영일 (강원도립대학교 해양경찰과) ;
  • 이춘우 (부경대학교 해양생산시스템관리학부) ;
  • 박수봉 (부경대학교 저탄소해양생산기술연구소)
  • Received : 2017.12.13
  • Accepted : 2018.05.11
  • Published : 2018.05.31
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Abstract

In this study, we tested Japanese trolling lines in the Jeju fishery. This fishery simulates the natural marine environment with many seabed rocks, and has been redesigned and manufactured it to be suitable for the Jeju fishery. In order to ensure that the trolling lines were deployed at the inhabitation depth of hairtails, the conditions required for the fishing gear to reach the target depth were determined for use during the experiment. The experimental test fishing was conducted at the depth of 120 m water in front of Jeju Seongsanpo and in the offshore area of Jeju Hanlim. The fishing gear used in the test fishing is currently used in a variety of field operations in Japan. However, several problems were identified, such as twisting of the line during its deployment and excessive sinking of the main line. The fishing gear was, therefore, redesigned and manufactured to be more suitable for the Jeju fishery environment. For the fishing gear to accurately reach the target depth, depth loggers were installed at the starting point of the main line and at the 250 m and 340 m points of the line. Depth and time were recorded every 10 seconds. According to the daytime positioning of hairtails in the lower water column, the target depth of the fishing gear was set at 100-110 m, which was 10-20 m above the sea floor. At a speed of 1.9 knots and with a 9 kg sinker attached, the main fishing line was deployed and catch yields at depths of 100 m, 150 m and 180 m were recorded and analyzed. When the 180 m main line was fully deployed, the time for the hairtail trolling lines to arrive at the appropriate configuration had to be 5 minutes. At this time, the depth of the fishing gear was 16-23 m above the sea floor, in accordance with the depths at which the hairtails were during the day. In addition, in order to accurately place the fishing gear at the inhabitation water depth of hairtails, the experimental test fishing utilized the results of the depth testing that identified the conditions required for the fishing gear to reach the target depth, and the result was a catch of up to 97 kg a day.

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References

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