David M. Farmer
Inst. of Ocean Sciences, 9860 W. Saanich Rd., Sidney, BC V8L 4B2, Canada
Salmon migrating up the Fraser River produce an identifiable scintillation signal as they pass through high-frequency acoustic paths directed transversely across the flow. The scintillation field due to the fish can be identified by its differential motion with respect to that due to background turbulence which moves downstream with the river flow. The potential of this technique is explored in terms of a model for forward acoustic scattering from fish and the application of spatial aperture filtering and reciprocal transmission analysis. Results of recent laboratory and field studies will be presented.