The Commissioner of Agriculture shall cause those natural or public oyster beds in the exclusive jurisdiction of this state, known and described in section 3295 of the general statutes, revision of 1918, as the Stratford bed, Fish Island and Roton Point beds, the Bridgeport bed and the Fairfield Bar and Fairfield beds, to be marked by buoys which shall be known as state buoys, and by range monuments on the shore by which the lines can be relocated should any buoys be removed, and shall cause double buoys or a distinctive mark to be placed at any point on the boundary where the line changes in direction, and such buoys shall be maintained by the state. No buoys shall be set in lines so run as to include within the natural or public beds any private or designated grounds.