Long-term oyster reef restoration shows clear success in murky waters

by Sarah Hansen, University of Maryland, Baltimore County
September 16, 2026

Large-scale oyster reef restoration in the Chesapeake Bay is successfully creating three-dimensional habitats that support larger, more diverse fish communities, according to new research from scientists at UMBC, the Smithsonian Environmental Research Center, and the National Oceanic and Atmospheric Administration (NOAA). The study, published in Ecosphere, provides compelling evidence that restoration efforts are shifting underwater ecosystems from communities dominated by small, transient schooling fish to those supporting larger, resident species.

The research focused on Harris Creek, on Maryland’s Eastern Shore, one of the world’s largest oyster restoration projects, covering approximately 1.4 square kilometers. By combining underwater video with high-resolution imaging sonar, the team evaluated reef habitat and “nekton”—free-swimming animals like fish and turtles—six to 10 years after restoration was completed.

“Oyster restoration is important for lots of different stakeholders in Chesapeake Bay, so we wanted to know precisely how it influences reef habitat and the fish and crabs that use that habitat,” says Allison Tracy, the study’s lead author and assistant professor of marine biotechnology with UMBC at the Institute of Marine and Environmental Technology. “Large-scale oyster reef restoration in Chesapeake Bay has been a success,” Tracy adds, “and our study adds new and important metrics of success for one of the most high-profile sites in the project.”

Keep reading: https://umbc.edu/stories/oyster-reef-restoration-success-in-murky-waters/

Read the Ecosphere paper: https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecs2.70750