towfish towfishan instrument, such as a side scan sonar, that is towed behind a ship Related Articles: Acoustic TranspondersHow is sound used to find objects on the ocean bottom?Side Scan SonarTutorial: Find Objects on the Sea FloorDeep-Sea BiologistHow is active acoustics used in fisheries research and management?Marine/Maritime/Underwater Archaeologist Chris Knowlton2017-02-26T20:10:02-05:00