주파수 70 kHz를 이용한 청어의 유영자세각과 체장에 따른 초음파산란강도의 변동
Variation of target strength by swimming orientation and size for Pacific herring (Clupea pallasii) at the frequency of 70-kHz
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본 연구에서는 음향을 이용하여 청어의 시공간적인 분포와 현존량을 파악하기 위한 기초 자료로서, 최근 조사용 과학어군탐지기의 어종식별을 위해 주목받고 있는 70-kHz 주파수 대역을 이용하여 청어의 자세각 및 체장 변화에 따른 TS를 측정하였다. 실험에 사용된 청어는 14개체로 가랑이 체장은 20.3~29.8 cm, 습중량은 187.6~269.9 g의 범위이었다. 청어의 자세각 (-30~30°)에 따른 TS측정값은 10.3~18.8 dB의 차이가 나타났으며, 청어의 머리가 아래로 향할 때 부레의 기울기에 따른 산란단면적이 최대가 되는 각도에서 가장 높은 TS값을 나타내었다. 청어의 TS-FL의 관계식은 주간과 야간시간대의 유영자세각을 각각 3.8±6.0° 및 –3.2±13.6°을 적용하였으며 합성한 결과, 주간과 야간시간대의 체장의존식은 TS=20log10(FL)-66.79으로 동일하게 나타났다
Abstract
We measured the target strength according to the swimming tilt angle and size change for Pacific herring at the frequency of 70 kHz as the basic database in order to estimate its abundance as well as density in the survey area using the hydroacoustical method. The number of the sample used in this study was 14 individuals, and its size distribution by fork length ranged between 20.3 and 29.8 cm and wet weight was measured between 187.6 and 269.9 g. The variation of TS according to the swimming angle (-30~30°) was measured between 10.3 and 18.8 dB in frequency range, the highest value was measured at head-down of Pacific herring in the tilt angle range between 5 and 9 deg. of its swimbladder. The relationship between TS–FL of herring was the same as TS = 20log10 (FL) – 66.79 when its swimming tilt angle in the daytime (3.8 ± 6.0°) and nighttime (-3.2 ± 13.6°), respectively.
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