Three Spined Sticklebacks (image) University of Leicester Caption This image shows three spined sticklebacks naturally infected with S. solidus, showing characteristic body swelling caused by growing the parasites. Credit University of Leicester Usage Restrictions Use only with credit. 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.