swim bladder swim bladdera gas filled organ that is primarily used for buoyancy control but is also important for hearing in some fishes. Related Articles: Glossary: drummingGlossary: Weberian ossiclesPassive Acoustic Monitoring Critical to Vaquita Conservation Efforts – October 26, 2017How is sound used to locate fish?DOSITS VideosBlast Injury, Barotrauma, and Acoustic TraumaWhat components of sound are used for hearing?How is sound used to identify fish?Fish Finding SonarBar Jack Chris Knowlton2017-02-26T20:10:03-05:00