La. Navigation and Shipping § 34:867
If any seaman deserts from any vessel in any of the ports of this state, or in the voyage from the sea up to either of them, the master of the vessel shall, within twelve hours after his arrival, if such desertion has taken place before his arrival, or within twelve hours after the desertion, if it happens in the port, make out an advertisement containing the name of the seaman and of the vessel to which he belonged, together with a description of the person of the deserter; this advertisement shall be signed by the master, and, within the time aforesaid, put up in the office, of the mayor of the city of New Orleans.
In all seaports, other than the city of New Orleans, the advertisements shall be made at the courthouse of the parish in which the port may be situated.
La. Navigation and Shipping § 34:867