No person shall take or gather for commercial purposes oysters, clams, mussels or other molluscan shellfish from any natural shellfish bed in the state and no person shall be permitted upon any boat, licensed pursuant to the provisions of section 26-212, while the boat is being used for such taking or gathering until the person has been licensed in the manner provided in this section. The person shall apply in writing, to the Commissioner of Agriculture upon blanks to be furnished by the commissioner, stating his name, residence and post-office address and such other information as may be required by said commissioner, and said commissioner, upon payment of a fee of twenty dollars, shall issue to the person a license for such purpose. All licenses so issued shall be revocable at any time by the commissioner and shall expire on the twentieth day of July in each year. The commissioner shall account to the Treasurer for all moneys received for licenses under the provisions of this section. Any person who violates any of the provisions of this section relating to licensing shall be guilty of a class D misdemeanor.