Except in the case of clams reared on shellfish aquaculture lease sites on Delaware's Inland Bays, the Department will establish by regulation the seasons for the taking of clams and/or limit the number of clams which may be harvested commercially by any 1 licensee. If, in its discretion, the Department determines from biological evidence that emergency restrictions are necessary to protect clams or other shellfish resources of the State, they may do so with advance notice as it deems necessary.