U.S. Department 

 of Commerce 



William M. Daley 



Secretary 



National Oceanic 

 and Atmospheric 

 Administration 



D. James Baker 



Under Secretary for 

 Oceans and Atmosphere 



National Marine 

 Fisheries Service 



Penelope D. Dalton 



Assistant Administrator 

 for Fistierles 



Scientific Editor 



Dr John V. Merriner 



Editorial Assistant 

 Sarah Shoffler 



Southeast Fisheries Science Center 

 National Marine Fisheries Service, NOAA 

 101 Pivers Island Road 

 Beaufort, NC 28516 



^ATE5 OV 



The Fishery Bulletin (ISSN 0090-0656) 

 is published quarterly by the Scientific 

 Publications Office, National Marine Fish- 

 eries Service, NOAA, 7600 Sand Point 

 Way NE, BIN C15700, Seattle, WA98115- 

 0070. Periodicals postage is paid at Se- 

 attle, WA, and at additional mailing of- 

 fices. POSTMASTER: Send address 

 changes for subscriptions to Fishery Bul- 

 letin, Superintendent of Documents, Attn.: 

 Chief, Mail List Branch, Mail Stop SSOM, 

 Washington, DC 20402-9373. 



Although the contents of this publica- 

 tion have not been copyrighted and may 

 be reprinted entirely, reference to source 

 is appreciated. 



The Secretary of Commerce has deter- 

 mined that the publication of this peri- 

 odical is necessary according to law for the 

 transaction of public business of this De- 

 partment. Use of funds for printing of this 

 periodical has been approved by the Di- 

 rector of the Office of Management and 

 Budget. 



For sale by the Superintendent of 

 Documents, U.S. Government Printing 

 Office, Washington, DC 20402. Subscrip- 

 tion price per year: $50.00 domestic and 

 $62.50 foreign. Cost per single issue: 

 $19.00 domestic and $23.76 foreign. See' 

 back for order form. 



Managing Editor 

 Sharyn Matriotti 



National Manne Fisheries Service 

 Scientific Publications Office 

 7600 Sand Point Way NE, BIN C 15700 

 Seattle, Washington 98115-0070 



Editorial Committee 



Dr Andrew E. Dizon National Marine Fisheries Service 



Dr. Harlyn O. Halvorson University of Massachusetts, Boston 



Dr Ronald W. Hardy University of Idaho, Hagerman 



Dr. Richard D. Methot National Marine Fisheries Service 



Dr Theodore W. Pietsch University of Washington, Seattle 



Dr Joseph E. Powers National Marine Fisheries Service 



Dr Harald Rosenthal Universitat Kiel, Germany 



Dr Fredric M. Serchuk National Marine Fisheries Service 



The Fishery Bulletin carries original research reports and technical notes on investi- 

 gations in fishery science, engineering, and economics. It began as the Bulletin of the 

 United States Fish Commission in 1881; it became the Bulletin of the Bureau of Fisher- 

 ies in 1904 and the Fishery Bulletin of the Fish and Wildlife Service in 1941. Separates 

 were issued as documents through volume 46; the last document was No. 1103. Begin- 

 ning 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. 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. 

 Government Printing Office, Washington, DC 20402. It is also available free in limited 

 numbers to libraries, research institutions, State and Federal agencies, and in exchange 

 for other scientific publications. 



