Md. Code, Natural Resources § 4-405

The Department may establish and maintain any State fish refuge to protect and propagate fish throughout the State. The Department may locate, with the consent of the Governor and of the superintendent in charge of any federally or State–owned area of water or land, any State fish refuge on State–owned or federally–owned water or land. The boundaries of each fish refuge shall be clearly marked. At each refuge boundary, a notice shall be posted in a conspicuous place informing the public the area of water or land is a “State fish refuge – fishing is unlawful”, and any other information or rules and regulations the Department considers advisable.