Broad bandwidth acoustic backscattering from sandeel—measurements and finite element simulations

Acoustic backscattering measurements were made of individual sandeel (Ammodytes marinus L.) at frequencies from 100 to 280 kHz in a laboratory tank. Measurements were made versus incidence angle, −30° to 30° relative to both dorsal and lateral aspect directions, for dead whole sandeel and for excised backbones. Backscatter spectra from whole fish have deep minima at frequencies that vary with fish length and shift to lower frequencies at higher...