Except as provided in §B of this regulation, a person may not catch, land, or possess a conch measuring less than 6 inches total length from the spiral apex to the outer tip of the opening. Channeled Whelk. A person may catch, land or possess a channeled whelk measuring less than 6 inches total length if the whelk has a girth that is a minimum of 3-3/8 inches in diameter.