Fish Play (IMAGE) University of Tennessee at Knoxville Caption A cichlid fish strikes a bottom-weighted thermometer that would immediately right itself. It was often struck repeatedly in bouts. Credit Ann Hawthorne. Usage Restrictions None 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.