The Commissioner of Conservation and Natural Resources shall have and exercise all rule-making powers of any division of the Department of Conservation and Natural Resources subject to the provisions of Section 9-2-15. The Commissioner of Conservation and Natural Resources shall have power and authority to establish and promulgate rules and regulations, including amendments and repeals thereof, with respect to the manner of performance of all functions and duties of the Department of Conservation and Natural Resources, which rules and regulations shall be reasonably calculated to effect the expeditious and efficient performance of such functions and duties and shall not be in conflict with applicable statutes. The rule-making power of the Commissioner of Conservation and Natural Resources shall not be delegated, except as otherwise expressly provided.