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Since a few decades, underwater substrata can be characterized by methods using acoustic technology. Compare to traditional in situ grabbing techniques (bottom grab sampler, video camera, ...), these methods allow a better spatial resolution. Until today, these acoustical techniques required specialized signal processing materials. This document presents works about lakebed classification using single beam echo sounder and a post processing software (Sonar5) dedicated to the estimation of fishdoi:10.4081/aiol.2011.5316 fatcat:mdrgk3zncrdf7eujf62hhyrfae