Abstract
Acoustic backscattering measurements were conducted of individual ray-finned fishes (Gnathopogon caerulescens) at frequencies from 30 to 150 kHz in an acoustic tank laboratory. Acoustic backscatter measurements for dead ray-finned fishes were made versus incidence angle from -30 deg to 30 deg relative to lateral aspect directions. Backscatter spectra from whole fish vary with the fish length and shift to lower frequencies at higher pitching angles. The backscatter spectra from pitching angle differ in both amplitude and positions. A cylindrical model of fish backscatter was developed and compared with the acoustic measurements.
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