Shell Budget (image) Virginia Institute of Marine Science Caption A simple accounting of the harvest and replacement of oyster shell in the Maryland portion of Chesapeake Bay, in millions of bushels by year. Credit Image courtesy of Maryland Dept. of Natural Resources Usage Restrictions One-time use only. 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.