The commissioner may establish and define by regulation, for the purpose of controlling waterfowl hunting, zones on either side of the lines fixed by it to distinguish open coastal waters beyond outer harbor limits where certain species of waterfowl may be taken during the open season. The area shoreward of such lines established by the commissioner and the mainland or shore shall, for the purpose of this section, be known as coastal waters within outer harbor limits and the area seaward of such lines shall be known as open coastal waters beyond outer harbor limits.