Scale-eating Pupfish (IMAGE) University of California - Davis Caption This pupfish from San Salvador island is the only species known to eat scales from other fish. Credit Chris Martin, UC Davis. Usage Restrictions May be used with credit. 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.