Definition. In this regulation, the following term has the meaning indicated. Term Defined. “Freshwater mussel” means all species of freshwater mussels in the order Unionoida. Prohibition of Catching, Possession, or Sale of Freshwater Mussels. Except as provided in §C of this regulation, a person may not catch, offer for sale, purchase, or possess any freshwater mussel caught in Maryland waters. Exceptions. The incidental catching of any freshwater mussel is not considered a violation of this regulation if the freshwater mussel is immediately returned unharmed to the water. The provisions of §A of this regulation do not prohibit the entry into the State or possession, transportation, exportation, processing, sale, offer for sale, or shipment of any freshwater mussels which were caught in waters not under Maryland jurisdiction if the person engaging in the activity demonstrates by a bill of sale that the freshwater mussels were lawfully taken and lawfully removed from another jurisdiction.