Blue Crab (image) Virginia Institute of Marine Science Share Print E-Mail Caption The Hematodinium parasite affects blue crabs and other crustaceans. Credit Photo by Stephen Salpukas Usage Restrictions One-time use only. 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.