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