수산해양기술연구(구 한국어업기술학회지) 58권 2호 (p.121-129)

도루묵의 체내 임피던스 및 유영자세각 평가

Estimation of swimming angle and body impedance of sandfish (Arctoscopus japonicus)
키워드 :
Sandfish,Acoustic,Density contrast,Sound-speed contrast,Swimming angle

목차

서 론
재료 및 방법
실험 샘플
   밀도비
   음속비
   유영자세각 관측
결 과
   밀도비 및 음속비
   유영자세각
고 찰
   어류의 밀도비와 음속비
   어류의 유영자세각
결 론
사 사
References

초록

Density and sound speed contrasts (g and h , respectively), and swimming angle were measured for sandfish (Arctoscopus japonicus) without swimbladder. The density contrast was measured by the volume displacement method while the sound speed contrast was measured by the acoustic measurements of travel time (time-of-flight method). The swimming angle was measured by dividing it into daytime, nighttime, daytime feeding and nighttime feeding. The g was 1.001 to 1.067 with an average (± standard deviation) of 1.032 (± 0.017), and the h was 1.007 to 1.022 with an average (± standard deviation) of 1.015 (± 0.003). The swimming angles (mean ± standard deviation) were 16.8 ± 10.3° during the daytime, 1.9 ± 12.3° during the nighttime, 30.2 ± 12.6° in the daytime feeding and 35.0 ± 13.2° in the nighttime feeding. These results will provide important parameters input to calculate theoretical scattering models for estimating the acoustic target strength of sandfish.