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The effect of hooking on thickness and length of branch line in fishing gear of long line at the coastal waters

연안 연승어구에 있어서 아릿줄의 굵기와 길이가 조획에 미치는 영향

  • Yang, Chin-Sung (Department of Fishery, Graduate School, Jeju National university) ;
  • Kim, Suk-Jong (Ocean and Environment Research Institute, Jeju National University)
  • 양진성 (제주대학교 대학원 어업학과) ;
  • 김석종 (제주대학교 해양과환경연구소)
  • Received : 2010.11.04
  • Accepted : 2012.01.18
  • Published : 2012.02.28

Abstract

As a basic study to improve hooking ability of long line fishing gear, which is widely used around Jeju-do coast, the researcher performed hooking experiment of parrot fish by manufacturing and installing 7 kinds of model long line fishing gears, whose thickness of branch line are different and 8 kinds of model long line fishing gear, whose length of branch line are different, in indoor circular aquarium, which is installed for the model experiment of thickness and length of branch line that are various by fishing implement and improper. The hooking rate depending on thickness and length of branch line was calculated and the effect of thickness and length of branch line on hooking rate was analyzed. Its results are as follows. When branch line was thin and long, high hooking rate appeared. In the scope of value setting, the relationship between thickness ($B_t$) of branch line and total hooking rate ($Th_r$) can be shown as following formula as. In the scope of value setting, the relationship between length ($B_t$) of branch line and total hooking rate ($B_t$) can be shown as $Th_r=-20.83B_t+26.04$. Through Pearson correlation analysis, the coefficient of correlation between thickness of branch line and hooking rate was -0.718. Therefore it showed significance in 0.01 significance level. Through Pearson correlation analysis, the coefficient of correlation between length of branch line and hooking rate was 0.431. Therefore it showed significance in 0.01 significance level.

Keywords

Long line;Hooking experiment;Hooking rate;Thickness of branch line;Length of branch line

References

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