16 U.S.C. § 745: Powers of Secretary

The Secretary of the Interior or the Secretary of Commerce, as appropriate, may take or cause to be taken at all times, in the waters of the seacoast of the United States, where the tide ebbs and flows, and also in the waters of the lakes, such fish or specimens thereof as may in his judgment, from time to time, be needful or proper for the conduct of his duties, any law, custom, or usage of any State to the contrary notwithstanding.