CALIFORNIA. 



SOLEDAD 



VISCAINO 



CAPE 



GULF 



_L 



_L 



m 



66 



71 



67 68 69 70 



HEAD LENGTH IN MM 

 FOR TOTAL LENGTH OF 250 MM 



72 



Figure U. — Overlap of head length in Pacific mackerel, after 

 Roedel (1952). The small triangle indicates the 

 estimated mean head length at 250 mm. fork length 

 and the hollow bar one standard deviation from 

 regression s either side of the mean, the 

 solid bar two standard errors of the mean sa 

 on each side of the mean. 



20 



