380 



BULLETIN OF THE BTIREAU OF FISHERIES 



and to predominate in the annual run. He found that "the relative numbers of males 

 and females in the different year groups is a comparatively constant feature in each 

 river basin" and "thus rises to the dignity of a racial character [p. 17]." 



Table 47. — Relative abundance of males and females in samples of lake herring taken at Bay City, 



Mich., in 19S1, 19M, 1923, and 1924 



The upper half of Table 47 shows the number of males and females in each 

 age group of each collection, while the lower half shows the percentage of these 

 numbers in the total number. At the bottom are shown the percentage of males 

 and females in each age group. At the right of the table the number and percentage 

 of males and females in each collection are given, while at the bottom of these figures 

 the percentage of males and females in the entire collection are shown. Table 47 

 shows that of 2,950 lake herring 49.5 per cent were males and 50.5 per cent females. 

 It is quite evident that the ratio 3 : 1 does not apply to Leucichthys artedi. The males 

 predominated in the individual collections of 1921 to 1923, forming from 56,2 to 



