EARLUK RIVER RED-SALMON INVESTIGATION 



43 



these facts it is apparent that the year 1916 produced a normal brood and contrib- 

 uted its due quota to the run of 1922, while the year 1917, with a pack practically 

 equal to 1916, had been largely a failure. The cause of this failure is again beyond 

 our knowledge. Weather conditions may have favored more than usually intensive 

 fishing, and the commercial catch may have been large at the expense of the spawn- 

 ing escapement. In that case, the pack of 166,000 cases in 1917 may have included 

 the greater part of the run of that year, with the escapement so reduced below a 

 safe minimum that no favorable results were possible. The only other alternative 

 would be a spawning escapement perhaps equally as large as was that of 1916, the 

 disparity in the results of the two years being due to unfavorable natural conditions 

 that decimated the 1917 brood. This question has always recurred in every discus- 

 sion of brood years and the runs for which they are responsible, and has always been 

 left without answer. Only when we shall deal with years in which the size of 

 spawning escapement is known, can we hope for a solution. 



Table 9. — Random samplings of the Karluk red-salmon run of 1922, distributed by age groups, sex, 



and length 



Length, in centimeters 



Age groups and sex 



Total 



4i 



4j 



4i 



4, 



6s 



5s 



54 



Si 



6i 



64 



6i 



74 



M 



M 



F 



M 



F 



M 



M 



F 



M 



F 



M 



F 



M 



M 



F 



M 



F 



M 



M 



F 



30. 













1 

 1 































1 

 1 



31 



















































































33 













1 































1 

 1 



34-- 

























1 

























































36-- 













































37-- 













































38 - 













































39-- 













































40 -- 









1 



































1 

 1 



41-- 





















1 





























































43 



















1 

























1 

 1 



3 

 1 



3 

 6 

 13 

 21 



24 

 38 

 67 

 101 

 107 

 126 

 139 

 208 

 257 

 244 

 248 

 234 

 195 

 144 



no 

 75 



46 

 25 

 17 

 9 











































45- 









2 

 1 



— » — 































46 





































47 







1 













1 

 4 



8 

 7 

 14 



22 

 31 

 48 



33 

 50 

 49 

 80 

 105 

 82 

 89 

 70 

 46 

 23 

 11 

 5 

 2 









































2 



















49.- 







1 













3 

 3 

 3 

 5 

 17 

 25 

 35 

 30 

 37 

 50 

 62 

 51 

 48 

 70 

 72 

 72 

 46 

 43 

 28 

 17 

 9 

 4 



















50 

























1 

 2 

 1 



"T 

 3 



""5" 

 6 

 2 



6 

 9 

 9 

 11 

 5 

 8 

 4 

 2 

 1 

 1 



2 

 1 

 1 



3 

 3 

 3 

 5 

 2 

 7 

 6 



9 

 4 



5 









51.. 























2 

 2 

 7 

 13 



19 

 27 

 37 

 43 

 63 

 68 

 62 

 42 

 24 

 10 

 6 

 2 

 1 









52- 







1 











1 





2 

 2 

 4 

 6 

 10 

 4 

 18 

 18 

 27 

 31 

 32 

 35 

 31 

 37 









53-- 







1 









1 







54 







1 







1 

 2 









1 



55 





1 

 1 















1 



56 











1 





57.- 





1 





1 











58 







3 

 1 













59 



























60 















2 









































62-. 





1 



4 



1 









1 

 1 















1 



63 



.... 



















64 



3 























65 























1 







1 



66.. 















1 











20 

 13 



7 

 7 

 5 







67 































68.. 

































69 





































70 





































Total 





































3 



3 



13 



17 | 2 



3 



4 



5 



731 



780 



23 



4 



1 309 



428 



79 



59 



1 



1 



3 



2, 469 





The frequency of sampling necessary to give an adequate account of the constitu- 

 tion of the run during the entire season depends, of course, on the degree of uniformity 

 or the lack of uniformity in the run itself from day to day and from week to week. 

 As appearsin Table 10, which follows, 12 different age groups were represented in the 



