Pacific Midshipman Fish Humming (2 of 2) (VIDEO) University of Pennsylvania This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Male Pacific midshipman fish vibrate the muscles around their swim bladders as many as 360,000 times in an hour to produce a mating call to attract females. New research unveils the physiology that makes these rapid muscle contractions possible. Credit Richard Brantley and Andrew Bass, Cornell University Usage Restrictions In context of reporting License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.