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A model for computing acoustic scattering by a swimbladdered fish withcoupling to surrounding fish tissue that is assumed to behave as a homogeneousfluid, is presented. Mathematically, this corresponds to considering theproblem of two penetrable scatterers immersed in a homogeneous medium, one ofwhich is wholly embedded in the other. The model is formulated in the frame ofboundary integral equations whose solution is achieved using the BoundaryElement Method (BEM) for a planar triangle mesh. The numerical implementationis verified against benchmark solutions reported in the literature. The modelis then applied to a specimen of \textit{Merluccius hubbsi}, whose morphometrywas determined by CT scanning, for evaluating its forward and backscatteringresponses. From the acoustic scattering viewpoint, the swimbladder isconsidered as a gas-filled object while the flesh constituting the fish bodyacts like a weak scatterer. The numerical results suggest the swimbladder andthe fish body responses, when fully coupled, can lead to substantialdifferences with respect to the simplified models normally in use in the areaof aquatic ecosystem research.

Boundary-element method to analyze acoustic scattering from a coupled swimbladder-fish body configuration