Boulder Creek Fish Tanks (IMAGE) University of Colorado at Boulder Caption A mobile fish lab on Boulder Creek is helping researchers assess the health of fish exposed to endocrine-disrupting chemicals polluting the waterway that can cause male fish to be feminized and decline in numbers. Credit Image courtesy Alan Vajda, University of Colorado Denver 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.