It shall be unlawful to buy, sell, barter, exchange, traffic or trade in, bargain for, solicit for, purchase, or transport out of the Commonwealth, any otter pelts until the pelts have been sealed by an agent of or other individual designated by the department. This requirement shall not apply to licensed taxidermists who ship otter pelts out of state for tanning purposes or to individuals who ship otter pelts out of state to be tanned for personal use. All otter pelts required to be sealed under the provisions of this chapter must be sealed not later than April 1 of the license year in which the animal is taken.