Oyster Killers Captured (image) University of British Columbia Caption Left: This is an oyster covered in green lesions caused by Denman Island disease. Right: This is a close-up look at the Mikrocytos mackini parasite. Credit UBC/Department of Fisheries and Oceans Usage Restrictions Use permitted with news coverage about study with proper credit attributed. 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.