살오징어 (Todarodes pacifica)의 음향 반사강도 측정
Acoustic Target Strength of Live Japanese Common Squid (Todarodes pacifica) for Applying Biomass Estimation
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다운로드
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참고문헌
초록
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 27cm) were used using small fishhook method, whereas for measurement of swimming angle, a total of 8 squids (ML: 21-27cm) 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 120kHz varied from -48.6 to -45.9dB, and from -46.5 to -44.6dB, respectively. In both frequencies, mean TS at 120kHz is relatively higher than that of 38 kHz, approximately 1.3-2.5dB. From free living condition, the mean swimming angle of the squids was -24º. The results of the measurement will be provided basic information for conducting acoustic surveys of the squid.
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