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Hooking rate and bait loss rate of traditional hairtail hand line according to immersion time in the coastal waters of Jeju

제주 연안 재래식 갈치 채낚기의 침지시간에 의한 조획률 및 미끼 탈락률

  • Kim, Byung-Yeob (Dept. of Marine Industrial Engineering, College of Ocean Science, Jeju National University) ;
  • Park, Young-Seok (Fisheries Engineering Division, Resources Researches Institute, Jeju Special Self-Governing Provence) ;
  • Lee, Chang-Heon (Training Vessel, College of Ocean Science, Jeju National University)
  • 김병엽 (제주대학교 해양과학대학 해양산업공학과) ;
  • 박용석 (제주특별자치도 해양수산자원연구소 수산공학과) ;
  • 이창헌 (제주대학교 해양과학대학 실습선)
  • Published : 2009.05.31

Abstract

This paper is to investigate the effect of the immersion time in the traditional hairtail hand line for developing the fishing methods and the fishing gear in the coast of jeju. The operating of 32 times was made with each different immersion time of hairtail hand line, and the relations between the catch and the immersion time were examined. As the result, targeted species rate was over 98% of total catch. From about 800 seconds after casting, the hooking rate was decreased and the bite loss rate was increased, it seems to be made by the decreasing factors of predators including the cutting of branch lines etc. In addition, it was supposed that the hooking rate and the bait loss rate had a deep connection with feeding time zone. The level of the correlation coefficient of the bait loss rate according to the immersion time was 0.54 at $p{\leq}0.01$, in the case of the hooking rate, 0.59 was chosen after about 800 seconds. The hooking rate and the bait loss rate according to the hook number were not irrelevant to the fish school layer. Additionally, it was assumed that the bait loss rate was related to the depth of water.

Keywords

Hairtail hand line;Hooking rate;Bait loss rate;Immersion time

References

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