Can the Port of San Diego’s oyster castles protect against erosion and boost biodiversity? In May, the Port installed 600 oyster castles as a way to increase biodiversity in an area that “has been manipulated so much over time to support infrastructure and our everyday uses,” according to Heather Carroll, director of Environmental Conservation at the Port of San Diego. They’re also used to protect the shoreline from erosion. These “castles” are similar to traditional construction blocks, but the