CSIRO and FSFRL samples were carried out at 

 the respective laboratories, and we are grate- 

 ful for the assistance of J. Young, J. May, 0. 

 Augustine, and P. Bonham. We thank B. 

 Hansen for drawing the figures, S. E. Wayte for 

 statistical advice, and J. M. Leis, R. E. 

 Thresher, V. Mawson, and F. R. Harden Jones 

 for reviewing the manuscript and suggesting 

 many improvements. 



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Tim L. O. Davis 

 Greg P. Jenkins 



CSIRO Division of Fisheries Research Marine Laboratories 



GPO Box 1538 



HobaH, Tasmania 7001. Australia 



Mori Yukinawa 

 Yasuo Nishikawa 



Japan Fisheries Agency 



Far Seas Fisheries Research Laboratory 



7-1, 5 Chome Orido 



Shimizu 12 Jt. Japan 



981 



