No person shall be appointed a bar pilot unless: (1) he is a qualified elector of the State of Louisiana; (2) has served at least twelve months next preceding the date of his application in a pilot boat at the mouth of the Mississippi River or other entrances into the Gulf of Mexico or other outside waters from the port of New Orleans; (3) has successfully passed the examination given by the board of examiners, and has been commissioned by the governor; and (4) has furnished a bond in favor of the governor in the amount of two thousand dollars conditioned on the faithful performance of the duties imposed upon them by this Sub-part.  This bond shall be approved by the Board of Commissioners of the Port of New Orleans.