A fine imposed on a seaman for any act of misconduct for which his or her agreement imposes the fine, shall be subject to the following—
(a) on the offender being discharged, and the offence and the entry in the official log book required by this Act to be made in respect thereof being proved to the satisfaction of the Registrar of Seamen or proper officer, the master or owner shall deduct the fine from the wages of the offender; and the fine so deducted shall be paid to the Registrar of Seamen, and if the master or owner of the ship fails without reasonable cause so to pay the fine he or she commits an offence;
(b) a seaman shall not be punished under this Act for an act of misconduct for which a fine is imposed and paid by or deducted from the wages of the seaman.