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Distribution patterns of the Japanese common squid, Todarodes pacificus attracted around the luring lamp on the jigging boat

채낚기 집어등 어선 주변에 유집된 살오징어, Todarodes pacificus의 분포 패턴

  • BAE, Jae-Hyun (East Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • LEE, Kyounghoon (School of Marine Technology, Chonnam National University) ;
  • JO, Hyeon-Jeong (Department of Marine Police and Technology, Gangwon State university)
  • 배재현 (동해수산연구소 자원환경과) ;
  • 이경훈 (전남대학교 해양기술학부) ;
  • 조현정 (강원도립대학교 해양경찰과)
  • Received : 2016.08.10
  • Accepted : 2016.08.31
  • Published : 2016.08.31

Abstract

This study investigated luring distributions by water layer of common squid which were targeted by angling fishing vessels equipped with LED and metal-halide lamps using a scientific echosounder with a 120 kHz frequency in order to develop energy-effective underwater fish aggregation devices. In the analysis, angles of a transducer were changed from $0^{\circ}$ to $45^{\circ}$ and were rotated every $10^{\circ}$ horizontally. It was shown that common squid were densely distributed from the surface to 40 m and they were also distributed in directions of $10^{\circ}{\sim}+30^{\circ}$, $-30^{\circ}{\sim}-60^{\circ}$, and $-120^{\circ}{\sim}-130^{\circ}$with the head of vessel as the center. Comparative results of angles of transducer on acoustical densities of common squid distributing in 21~40 m water depth showed an average $101.8m^2/nm^2$ in vertical direction of $0^{\circ}$, $12.3m^2/nm^2$ in angle of $30^{\circ}$, and $42.4m^2/nm^2$ in angle of $45^{\circ}$, respectively. It implied that more considerations on acoustic scattering strength by incidence angle direction of the transducer and swimming oriental angle direction of common squid would be required.

Keywords

References

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