X REPORT TO THE SECRETARY OF COMMERCE 



"Sec. 6. (a) Aiiy emi)loyce of the Department of Commerce authorized by 

 the Secretary of Commerce to enforce the provisions of this Act (1) shall have 

 power, without warrant, to arrest any jierson committing in the presence of such 

 employee a violation of tliis Act or any regulation made in pursuance of this Act, 

 and to take such ])erson immediately for examination or trial before an officer 

 or court of competent jurisdiction; (2) shall have jjower to execute any warrant 

 or other process issued by an officer or court of competent jurisdiction to enforce 

 the provisions of this Act or regulations made in pursuance thereof; and (3) shall 

 have authority, with a search warrant issued by an officer or court of competent 

 jurisdiction, to make search in accordance with the terms of such warrant. Any 

 judge of a court established under the laws of the United States or any United 

 States com'uissioner may, within his resjiective jurisdiction, upon proper oath or 

 affirmation showing prot^able cause, issue warrants in all such cases. 



"(b) All fish delivered for transportation or which have been transported, pur- 

 chased, received, or which are being transported, in violation of this Act or any 

 regulations made pursuant thereto, shall, when found by such employee or by 

 any marshal or deputy marshal, be summarily seized by him and i)laced in the 

 custody of such persons as the Secretary of Commerce shall by regulations pre- 

 scril)e, and shall, as a part of the penalty and in addition to any fine or imprison- 

 ment imposed under section 7 of this Act, be forfeited by such court to the United 

 States upon conviction of the offender under this Act, or upon judgment ofthe 

 court that the same were transported, delivered, purchased, or received in 

 violation of this Act or regulations made pursuant thereto. 



"Sec. 7. In addition to any forfeiture herein provided, any person who shall 

 violate any of the provisions of this Act shall, upon conviction thereof, be pun- 

 ished by a fine not exceeding $200, or imprisonment for a term of not more than 

 three months, or by both such fine and imprisonment, in the discretion of the 

 court. 



"Sec. 8. Nothing in this Act shall be construed to prevent the several States 

 and Territories from making or enforcing laws or regulations not inconsistent with 

 the provisions of this Act, or from making or enforcing laws or regulations which 

 shall give further protection to large-mouth and small-mouth black bass. 



"Sec. 9. Nothing in this Act shall be construed to prevent the shipment in 

 interstate commerce of live fish and eggs for breeding or stocking purposes." 



Approved, July 2, 1930. 



DEVELOPMENT OF FISH SCREENS AND FISHWAYS 



Under the act of Congress approved May 1, 1928, the bureau was 

 directed to determine the best means of preventing the destruction of 

 fishes in irrigation ditches, canals, and other works. During the two 

 years of investigation substantial progress has been made in the solu- 

 tion of the problem. 



In the small to moderately large diversions, the most practical and 

 economical type of mechanical fish screen consists essentially of a 

 cylinder of heavy wire-mesh material placed in an appi'opriate sup- 

 j)orting structure and made to revolve on a hor'zontal axis in the direc- 

 tion of the stream flow, the motive power being furnished by a ])addle 

 or bucket wheel placed in the ditch below the screen. In addition 

 it is provided with the necessary by-pass chaimel for return of the 

 fish to the main stream. The type found to be the most practical 

 was that adopted by the Oregon Game Commission and the Washing- 

 ton Division of Fisheries. 



As a result of continued experimentation, the electric fish screen 

 for large diversions has been develoj)ed to a stage where it is successful 

 in divert'ng upstream migi-ating fish from tailrace waters; it has been 

 of value also for diverting downstream migrants from intakes, but 

 further experiments are needed to increase its efficiency, simplify its 

 design, and i-cduce its cost. Additional experiments shoiild be made 

 to determine the best type of current and the best voltage values to 

 be specified for electric screens. 



