A moratorium is imposed on the taking, possessing, or landing of abalone (genus Haliotis) for commercial or recreational purposes in ocean waters of the state south of a line drawn due west magnetic from the center of the mouth of the San Francisco Bay, including all islands offshore the mainland of California, including, but not limited to, the Farallon Islands and the Southern California Channel Islands. It is unlawful to take, possess, or land abalone for commercial or recreational purposes in those ocean waters while the moratorium is in effect.