KAKLUK EIVEE RED-SALMON INVESTIGATION 



47 



these groups that we secured in our random sampling were taken only in the latter 

 part of the summer. 



Those next in succession are the 4 3 and the 5 4 groups, which matured during their 

 second season in the sea, remaining one year longer than the 3 3 and the 4 4 groups. 

 In the 4 3 and 5 4 groups an interesting anomaly is found in the presence of two distinct 

 maxima in their runs. As shown in Table 13, a portion of them enter early with the 

 first part of the run, are found each day consistently in our samples, and then, for a 

 period of a month or more, almost wholly disappear, to be followed in August and 

 September with a second run of greater proportions than the first. The early running 

 fish of these two groups agree in being exclusively males, while in the fall a sprinkling 

 of females appear, the majority of which belong to the 5 4 group. We have no explana- 

 tion to offer for this peculiar feature of their run. In Table 10, for the year 1922, 

 the same bimodal tendency is shown in these two groups; less marked than in 1924, 

 because the representatives of the groups in 1922 were comparatively few in number. 



Table 13. — Karluk red-salmon run of 1924. Percentages of each age group in random samplings 



throughout season 



Date 



3s 



ii 



ii 



4j 



it 



52 



5s 



5» 



63 



6t 



7« 











5 





1 



72 





18 



2 



2 









1 



2 





1 



83 



1 



3 



1 



June 13 and 14 







1 





1 



81 



10 8 



7 



June 16 and 17 







1 



2 





2 



78 



1 



10 



6 





June 18 and 19 







1 



2 







84 



1 



4 



8 





June 20 and 21 









2 





1 



82 

 86 



2 



4 



8 



1 



June 23 









1 





1 



4 



7 



1 



June 25 and 26 







1 



2 







80 



1 



10 

 6 



5 



1 



June 27 









4 





1 



84 



5 





June 30 to July 1 









4 





1 



80 



1 



6 



8 





July 3 









6 





1 



72 



2 



7 



11 



1 



July 6. 







1 



2 





1 



72 



2 



7 



15 





July 7 











3 



72 





11 



13 



1 



July 8 and 9 





1 









1 



81 





2 



15 





July 10 and 11 











1 



76 





4 



19 





July 12 and 14 







2 







1 



72 





8 



17 





July 15 and 16 . 













73 

 69 





3 



22 



2 



July 19 and 20 

















4 



24 



3 



July 22 and 23 







2 



1 







66 





8 



23 





July 24 and 25 















80 





4 



15 



1 

















79 



1 



2 



18 



















75 



5 



20 





July 31 and Aug. 1 







1 



1 







81 





2 



14 



1 



Aug. 2 and 4 







2 







72 





5 



21 





Aug. 5 and 6 









3 







75 





2 



20 





Aug. 7 and 8 













1 



61 



1 



2 



35 





Aug. 9 and 16 







1 





81 



1 



17 





Aug. 18 and 19 







4 







79 



3 



14 





Aug. 20 and 21 





1 



5 







69 



7 





18 





Aug. 22 and 23 





3 







79 



5 





13 





Aug. 25 and 26 









3 







81 



1 





15 





Aug. 27 and 28... 









2 



1 





76 



2 



2 



17 





Aug. 30 and Sept. 1 



1 







4 



2 





73 



6 





14 



9 





Sept. 2 and 4 







15 







64 



23 







Sept. 6 and 8 









3 







73 



9 





15 





Sept. 9 and 10 









9 



8 





61 

 71 



12 





10 

 9 





Sept. 11 and 12 









7 







13 







Sept. 13 and 15. 









8 



2 





59 

 68 



18 

 8 



1 



12 





Sept. 16 and 18 









10 



3 





1 



10 























The next series, selected on the basis of length of residence in the sea, are the 

 4 2 , 5 3 , and 6 4 groups. In each of these maturity was reached in their third season 

 in the sea. In a measure they seem to present a transition between the early-running 

 and late-running series. In 1922 the 4 2 group appeared to belong with the latter, as 

 the majority of the individuals occurred in the samples taken in August and Septem- 

 ber; but in the 1924 run no such tendency is shown, as virtually all the samples ob- 



