Fathead Minnows in a Holding Tank (IMAGE) Society for Experimental Biology Caption Fathead minnows fail to detect a danger signal emitted by other fish in waters contaminated with copper. Credit Bill Dew 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.