Acoustically induced streaming flows near a model cod otolith and their potential implications for fish hearing.

摘要: The ears of fishes are remarkable sensors for the small acoustic disturbances associated with underwater sound. For example, each ear Atlantic cod (Gadus morhua) has three dense bony bodies (otoliths) surrounded by fluid and tissue, detects sounds at frequencies from 30 to 500 Hz. have also been shown localize sounds. However, how their perform these functions is not fully understood. Steady streaming, or time-independent, flows near a 350% scale model otolith immersed in viscous were studied determine if contain acoustically relevant information that could be detected ear's sensory hair cells. was oscillated sinusoidally various orientations 8-24 Hz, corresponding an actual frequency range 280-830 Phase-locked particle pathline visualizations resulting give velocity, vorticity, rate strain fields over single plane this mainly two-dimensional flow. Although streaming information, displacements due likely too explain hearing abilities threshold. results, however, may suggest possible mechanism detection ultrasound some fish species.