Male Stickleback in Breeding Condition (image) University of Leicester Share Print E-Mail Caption Male stickleback in breeding condition attending his nest. Heavily infected fish are rarely able to reproduce. Credit University of Leicester Usage Restrictions Use only with credit. Share Print E-Mail 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.