음향산란이론모델을 이용한 살오징어(Todarodes pacifica)의 음향후방산란강도 측정

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Recently, Japenese common squid, an important fisheries resource, has been decreased in the coastal waters of Korea. The purpose of this study is to estimate the TS of Japanese common squid and to use it as basic data to figure out the exact amount of resources of Japanese common squid. In order to estimate the TS, the total length and mantle length of 26 common squids were measured and photographed. The samples photographed were digitized and applied to the DWBA theoretical model. In the shortest mantle length No. 10 sample, the range of acoustic backscattering target strength for each frequency was measured –101.4 dB∼–55.9 dB at 38 kHz, –91.9 dB∼–57.1 dB at 70 kHz, –99.8 dB∼–56.2 dB at 120 kHz. The acoustic scattering strength range of No. 21 sample with the longest mantle length was measured –98.44 dB∼–55.3 dB at 38 kHz, –84.9 dB∼–53.8 dB at 70 kHz, and –89.5 dB ∼–51.5 dB at 120 kHz. The TS regression equations for common squid at each frequency was as follows; 38kHzSUBMax/SUB = 20logSUB10/SUB(ML) - 71.5, 38 kHzSUBAvg/SUB = 20logSUB10/SUB(ML) – 81.5, 70kHzSUBMax/SUB = 210logSUB10/SUB(ML) – 76.9, 70kHzSUBAvg/SUB. 20logSUB10/SUB(ML) - 82.8, 120kHzSUBMax/SUB = 20logSUB10/SUB(ML) – 75.6, 120kHzSUBAvg/SUB = 20logSUB10/SUB(ML) – 83.0