PACIFIC HERRING 
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percentages at each length and replotted. The resulting smoothed curves gave a 
fair fit, as illustrated by Figure 20, showing the average percentages in each centi- 
meter category and the smoothed curves for Elrington Passage in 1927 and Stephens 
Passage in 1928. 
The smoothed head-length curves are shown in Figures 21, 22, and 23. Figure 
21 shows that Craig and Stephens Passage are very similar, but southeastern Alaska 
BODY LENGTH IN MILLIMETERS 
Figure 20. — Percentage head is of body. Smoothed curves and actual data for Elrington Passage, 1927, and 
Stephens Passage, 1928, to illustrate the closeness of fit of the smoothed curves 
(the combination of the two curves) shows distinct differences from both Prince 
William Sound and the other central Alaska curve. 
The component samples of the Prince William Sound curve are given in Figure 22. 
The McClure Bay and the two Naked Island samples are slightly above the main 
group but do not approach the southeastern Alaska group. 
There is one disturbing factor in the comparisons of these head-length curves, and 
that is condition. The two Naked Island samples are a good illustration. The 1925 
sample was taken in August when the fish were fat, while the 1927 Naked Island fish, 
with longer head measurements, were taken early in June and were extremely thin. 
