Abstract
A composite scattering model has been developed to describe the backscattering by swimbladder‐bearing fish. This model includes the influence of elongation of the swim‐bladder not only on the resonance frequency, as do most of the existing scattering models, but also on the quality factor Q and the overall scattering level. In addition, within the region covering the transition from resonance scattering to geometric scattering, the effect of asymmetric cross section of the swimbladder has also been included to represent a more realistic shape of fish swimbladder. The model was compared with other scattering models, such as Kirchhoff ray mode (KRM) and Fourier matching method (FMM). Model predictions were then compared with field data collected with a new broadband towed system. For a single‐species Atlantic herring school (Clupea harengus) with a measured length distribution, the predicted resonance scattering including resonance peak location and overall level matched the broadband acoustic data reasonably well. Some modeling issues will also be discussed.
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