It is unlawful for a person to have any oysters or shells on the culling board, deck, washboard, or other receptacle above the hold of the boat or in the deckhouse of the boat when the boat is not at anchor, is off the public rocks, or is approaching a buy boat or a landing. The attempt of any person to escape, to throw oysters or shells into the water other than in the ordinary process of culling, or to place oysters or shells on the culling board or deck from the hold, upon the approach of the officer, shall be prima facie evidence of the violation of the Commission’s culling regulations.