AN ACT To authorize the establishment of fish hatcheries in the States of Georgia and Michigan; to authorize the rehabilitation and expansion of rearing ponds and fish cultural facilities in the States of New York and Colorado; to authorize the Secretary of the Interior to undertake a continuing study of shad of the Atlantic coast; and to amend the Act of August 8, 1946, relating to investigation and eradication of predatory sea lampreys of the Great Lakes, and for other purposes.