Male Daphnia (image) North Carolina State University Caption Researchers exposed Daphnia to varying levels of an insecticide called pyriproxyfen. The pyriproxyfen exposure resulted in Daphnia producing more male offspring (like that seen here) and fewer offspring in total, with higher doses exacerbating both effects. Credit Gerald LeBlanc, North Carolina State University Usage Restrictions Image credit must be given. 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.