It is unlawful for any person, firm or corporation to set a gill or trammel net in the marine waters of the state north of Highway 90. Any person, firm or corporation violating this section shall be punished as provided for under Section 49-15-100 and in addition shall forfeit vessel, motor and equipment used in the violation. If the person in possession of or using the nets in the violation is not the owner or licensee of the nets, the department shall notify the owner or licensee of the nets. The nets shall be subject to forfeiture unless the nets were stolen and prosecution for the theft is initiated.