Notwithstanding the provisions of this chapter, the director may, by issuance of a written permit under such terms and conditions as he may impose, authorize the possession and taking of fish at any season and of any size for purposes of propagation, rearing, harvesting or sale in connection with an aquacultural enterprise in which the fish being so propagated, reared and harvested are kept separate from natural stocks of the same species.
Mass. Gen. Laws ch. 130, § 17B