356 BULLETIN OF THE BUREAU OF FISHERIES 



AVERAGE AND EXTREME LENGTH AND WEIGHT OF HERRING 



FISH OF DIFFERENT SCHOOLS 



The average standard length of the 266 herring taken on October 29, 1921, from 

 1 pound net is 237 milhmeters (9.3 inches), of the 414 herring taken on different days 

 between October 26 and November 4, 1921, 236 miUimeters (9.3 inches), or of all the 

 1921 fish 236 millimeters. The average size of the 501 fish taken November 1, 1922, is 235 



Fig. 37.— Frequency polygons showing for each sample of herring taken in 1921, 1922, 1923, and 

 1924 the number of individuals in each size group at 5-millimeter intervals. The data are 



shown in Table 29. , 1921; . , 1922; , 1923; . . , 1924 



(Tobico and Nayanquing samples combined) 



millimeters (9.3 inches); of the 519 herring taken November 12, 1923, 241 millimeters 

 (9.5 inches); and of the 611 herring taken in 1924 at Tobico and Nayanquing, 244 

 millimeters (9.6 inches). The 542 Gravelly Point fish and the 119 Au Ores specimens 

 taken in 1924 averaged the same in length — 240 millimeters (9.4 inches). All the 

 1924 herring together, 1,272 in number, measured 242 millimeters (9.5 inches) in 

 length (bottom of Table 29). The length frequencies of Table 29 and the frequency 

 curves of Figure 37 show that the mode for these herring shifted from 226-230 

 milhmeters in 1921 to 236-240 millimeters in 1922 and 1923 to 231-235 millimeters 

 in 1924. The smallest specimen taken in these samples measured 160 milhmeters 

 (6.3 inches) in length, the largest 365 millimeters (14.3 inches) (Table 31). 



