Abstract
Identification and classification of fish species are essential for acoustic surveys of fisheries. The echo from the fish contains components from multiple reflections, including the swimbladder and other organs. The target strength (TS) and temporal structure, which were measured and analyzed by using the broadband signal, were changed dependent on the incident angles and fish species. The cepstral analysis, which was defined as the inverse Fourier transform, was used to discriminate between the spectral pattern associated with the swim bladder and the interference pattern associated with these reflections. Echoes of Japanese jack mackerel (Trachurus japonicus), chub mackerel (Scomber japonicus), and red sea bream (Pagrus major) were measured and analyzed in the sea and tank. It was clarified that the spectral pattern associated the swim bladder was strongly dependent on both the tilt angle and the fish species. [Supported by the Research and Development Program for New Bio-industry Initiatives, and CRES...
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