FISHERY BULLETIN: VOL. 71, NO. 1 



Dr. C. Dale Becker undertook to complete the 

 manuscript from a preliminary analysis and re- 

 port by Mrs. Nora R. Scofield. Supplemental 

 data, collected earlier by Dr. Becker while with 

 the Fisheries Research Institute, have been in- 

 cluded in this paper. Assistance and advice were 

 given by Drs. A. K. Sparks and 0. A. Mathisen 

 throughout the course of the study. 



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