16 U.S.C. § 748

Appropriations for propagation of food fishes shall not be expended for hatching or planting fish or eggs in any State in which, in the judgment of the Secretary of the Interior, there are not adequate laws for the protection of the fishes, nor in any State in which the United States Director of the Fish and Wildlife Service and his duly authorized agents are not accorded full and free right to conduct fish-cultural operations, and all fishing and other operations necessary therefor, in such manner and at such times as is considered necessary and proper by the said director or his agents.