Measuring Echo Strength of Fish and Sea Bottom Using Underwater Acoustic Instrument

Abstract

Underwater acoustic technology is indispensable method to receive underwater information. For this purpose, we used an underwater acoustic instrument with operating frequency of 200 kHz to detect and measure the echo strength of fish and sea bottom. The value of echo strength is important to be obtained not only in estimating fish stock, but also in designing and constructing of sonar instrument. By this research, the application of underwater acoustic technology is obtained to detect and quantify fish and sea bottom. Results showed the echo strength of fish depends on the orientation of fish to transducer. The echo strength of sand bottom is higher (8 dB) than fish target.