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- ItemApplication of ultrasonics in fishing industry and research - Part I(Seafood Exporters Association of India, 1969) Sivadas, T.K.The artichle discribs the application of ultrasonics in fishing industry.Ultrasonics is the very importent technic for underwater mesurement. It deals with ultrasonics for underwater use, sonar and its applications echo sounder and fish finder. The fecilities in modern fishing finder are white line, time signels, rangers, Visual indiction of signels , CRT display and underwater scaning system.