An improved method for mapping oyster bottom using a global positioning system and an acoustic profiler

A method for rapidly and relatively inexpensively mapping oyster (Crassostrea virginica) bottom is described. The method uses an acoustic profiler to differentiate substrate type, a fathometer to assess bottom relief and a global positioning system to accurately establish position. The method has the following desirable traits: can be performed from a small research vessel, usable in most weather conditions, requires only a two-person crew, rapidly discriminates bottom type while underway, usable in shallow (< 1 m) or deep (> 10 m) water, provides accurate and precise navigation. The method has been used successfully to map the oyster reefs and oyster bottom of Galveston Bay, Texas, an area of approximately 1000 km super(2)