Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Acoustic Target Strength of Live Japanese Common Squid(Todarodes pacifica) for Applying Biomass Estimation

살오징어 (Todarodes pacifica)의 음향 반사강도 측정

  • KANG Donhyug (Laboratory of Marine Environment and Resource Sensing, Hokkaido University) ;
  • HWANG Doojin (School of Fisheries and Ocean Science, Yosu National University) ;
  • MUKAI Tohru (Laboratory of Marine Environment and Resource Sensing, Hokkaido University) ;
  • IIDA KohjI (Laboratory of Marine Environment and Resource Sensing, Hokkaido University) ;
  • LEE Kyounghoon (Laboratory of Marine Environment and Resource Sensing, Hokkaido University)
  • 강돈혁 (북해도대학 수산과학연구과) ;
  • 황두진 (여수대학교 수산해양대학) ;
  • ;
  • ;
  • 이경훈 (북해도대학 수산과학연구과)
  • Published : 2004.08.01
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Abstract

Target strength (TS) of Japanese common squids (Todarodes pacificus) were measured using 38 and 120 kHz split beam scientific echosounders under the live condition. For the TS measurement of an individual, a total of 3 squids (mantle length (ML): 22.8, 25, and 27 cm) were used using small fishhook method, whereas for measurement of swimming angle, a total of 8 squids (ML: 21-27 cm) were used under live condition, confined with net cage with 2 m diameter At the same time, two underwater video cameras enabled continuous monitoring of squid behavior. Considering normal behavior, the mean TS at 38 and 120 kHz varied from -48.6 to -45.9 dB, and from -46.5 to -44.6 dB, respectively In both frequencies, mean TS at 120 kHz is relatively higher than that of 38 kHz, approximately 1.3-2.5 dB. From free living condition, the mean swimming angle of the squlds was $-24^{\circ}$. The results of the measurement will be provided basic information for conducting acoustic surveys of the squid.

Keywords

References

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