Virginia Institute of Marine Science
Proceedings of the National Shellfisheries Association
An underwater microphone has been developed to detect shell material on the bottom. The system is simple to use and easily constructed. It consists of a microphone encased in a PVC tube and suspended from an A-frame which is towed over the bottom. It is being used along with other methods to chart oyster bottoms in Virginia.
Haven, D. S.; Whitcomb, J. P.; Zeigler, J. M.; and Hale, W. C., "The use of sonic gear to chart locations of natural bars in lower Chesapeake Bay." (1979). VIMS Articles. 1262.