Miss. Code § 59-7-455
The duties and authority conferred in Sections 59-7-101 through 59-7-131, through 59-7-201 through 59-7-211, 59-7-501 through 59-7-519, and Sections 27-39-3 through 27-39-13, Mississippi Code of 1972, shall apply to any county coming within the provisions of this article commencing on the date of the adoption of the aforesaid resolution by the board of supervisors of said county; provided, however, that the members of such port commission shall be appointed by the method and for the terms as herein provided. In addition to the authority granted herein, the board of supervisors may, in its discretion, expend funds from any available source, including the county general fund and federal revenue sharing funds, to carry out the purposes of this article.
Miss. Code § 59-7-455