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http://dx.doi.org/10.5657/KFAS.2019.0709

Comparison of Broadband Acoustic Scattering Characteristics Between Japanese Flying Squid Todarodes pacificus and Golden Cuttlefish Sepia esculenta  

Lee, Dae-Jae (Division of Marine Production System Management, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.52, no.6, 2019 , pp. 709-718 More about this Journal
Abstract
Cephalopods, such as the Japanese flying squid Todarodes pacificus and golden cuttlefish Sepia esculenta, are an important food source for all toothed whales, particularly bottlenose dolphins in costal and offshore waters around the Korean Peninsula. A controlled laboratory experiment was conducted to investigate the broadband acoustic backscattering from live individuals of these two cephalopod species using linear chirp signals (100-200 kHz). The backscattered echo signal was measured at about 1° intervals from -45° (head down) to +45° (head up) in the dorsal plane. The species-specific, frequency-dependent scattering characteristics were investigated by comparing the relationship between the wavelength-normalized backscattering cross-section (σ/λ2) and the wavelength-normalized fish length L/λ for each species. The estimated σ/λ2 value for Japanese flying squid was 9.51 at an L/λ range of 12.79-30.27 (mean, 21.26). This was approximately 7% of the σ/λ2 value (136.1) for golden cuttlefish at an L/λ range of 9.07-25.49 (mean, 15.77).
Keywords
Broadband acoustic backscattering; Japanese flying squid; Golden cuttlefish; Wavelength-normalized backscattering cross section; Wavelength-normalized fish length;
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