Gender-bending Fish Research (IMAGE) University of Calgary Caption Lee Jackson, professor in the Department of Biological Sciences at the University of Calgary, is measuring dissolved oxygen, which when low, may interact with environmental contaminants to affect fish endocrinology. Credit Riley Brandt, University of Calgary 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.