BayWatch will be happy to give one of the reefs to residents who have a seawall. In return, the resident monitors the biological activity around and in the reef. The reefs are conical devices with variously sized holes in them. They remain secure in a few feet of water. Pretty soon oysters start growing on them.
More oysters grow on the ones that arrived first.
George Orsi's eighth-grade science classes helped with the project. Each oyster can filter a liter of water per hour, said Peter Clark, BayWatch director. And the rascals work 24 hours a day. Besides vacuuming nutrients, which cloud water and retard sea-grass growth, the reefs provide habitat. Crabs and baitfish swim in and out of the reef's holes.