The southern section of the Lagoon, the reefs and the grass flats northeast of Cas Cay remain superb examples of shallow tropical reef and marine pasture systems. They re- main so because of the unique northerly flow of clean water from the open sea, because they are not subject to heavy boat usage and because Long Point and the cays are undeveloped. The data collected in this study indicate this area is one of very high net productivity. Page 30