Caydence Lowe, left, and Tobias Dotson, 12th graders from Baltimore Lab School, count spat on an oyster shell Wednesday. They and several classmates are working at Lighthouse Point Marina in Canton on an oyster garden installation. Along with the Waterfront Partnership and Chesapeake Bay Foundation over the next year the students will manage oyster cages that they filled with shells and spat. (Barbara Haddock Taylor/Staff)