U.S. DEPARTMENT OF COMMERCE 



Peter G. Peterson, Secretary 



NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION 



Robert M. White, Adminisirator 



NATIONAL MARINE FISHERIES SERVICE 

 Philip M. Roedel, Direcfor 



Fishery Bulletin 



The Fishery Bulletin carries original research reports and technical notes on investigations in fishery science, 

 engineering, and economics. The Bulletin of the United States Fish Commission was begun in 1881 ; it became the 

 Bulletin of the Bureau of Fisheries in 1904 and the Fishery Bulletin of the Fish and Wildlife Service in 1941. Sep- 

 arates were issued as documents through volume 46; the last document was No. 1103. Beginning with volume 47 

 in 1931 and continuing through volume 62 in 1963, each separate appeared as a numbered bulletin. A new system 

 began in 1963 with volume 63 in which papers are bound together in a single issue of the bulletin instead of being 

 issued individually. Beginning with volume 70, number 1, January 1972, the Fishery Bulletin became a periodical, 

 issued quarterly. In this form, it is available by subscription from the Superintendent of Documents, U.S. Gov- 

 ernment Printing Office, Washington, D.C. 20402. It is also available free in limited numbers to libraries, research 

 institutions, State and Federal agencies, and in exchange for other scientific publications. 



EDITOR 



Dr. Reuben Lasker 



Scientific Editor, Fishery Bulletin 



National Marine Fisheries Service 



Southwest Fisheries Center 

 La JoUa, California 92037 



Editorial Committee 



Dr. Elbert H. Ahlstrom 

 National Marine Fisheries Service 



Dr. William H. Bayliff 



Inter-American Tropical Tuna Commission 



Dr. Daniel M. Cohen 



National Marine Fisheries Service 



Dr. Howard M. Feder 

 University of Alaska 



Mr. John E. Fitch 



California Department of Fish and Game 



Dr. Marvin D. Grosslein 

 National Marine Fisheries Service 



Dr. J. Frank Ilebard 



National Marine Fisheries Service 



Dr. John R. Hunter 



National Marine Fisheries Service 



Dr. Arthur S. Merrill 



National Marine Fisheries Service 



Dr. Virgil J. Norton 

 University of Rhode Island 



Mr. Alonzo T. Pruter 



National Marine Fisheries Service 



Dr. Theodore R. Rice 



National Marine Fisheries Service 



Di-. Brian J. Rothschild 



National Marine Fisheries Service 



Mr. Maurice E. Stansby 

 National Marine Fisheries Service 



Dr. Maynard A. Steinberg 

 National Marine Fisheries Service 



Dr. Roland L. Wigley 



National Marine Fisheries Service 



The Secretary of Commerce has determined that the publication of this periodical is necessary in the transaction 

 of the public business required by law of this Department. Use of funds for printing of this periodical has been 

 approved by the Director of the Office of Management and Budget through May 31, 1974. 



