KAELUK BIVEB EED-SALMON INVESTIGATION 



45 



Another series of changes that progressively follow the course of the run are 

 the increases in length and weight in both sexes of all the age groups. As an example 

 of the increase in length, we give in Table 11 the average lengths, in centimeters, 

 for males and females of the 5 3 group, separately for each date on which samples 

 were taken, the series being smoothed twice by threes. 



It will be apparent from this series that while the upward trend in length is 

 unmistakable for the entire season, it does not progress uniformly. In fact, through- 

 out the month of June the lengths in both males and females decrease fairly uni- 

 formly with each succeeding sample, the increase beginning with the sample of July 1 

 in the males and in the sample of June 27 in the case of females. This increase is 

 of short duration, however, for on July 14, in both males and females, another decrease 

 sets in, which reaches its culmination in both sexes on July 20. A more rapid increase 

 is then registered, which continues without interruption to the close of the season in 

 the case of males, with a slight recession in the mid-September samples in the 

 females. 



Other age groups give evidence of similaf increase in size during the season, 

 but the number of individuals present in each sample is so small that a reliable series 

 of averages can not be secured. 



Table 11.— Karluk red-salmon run, 1922 

 [Average lengths, In centimeters, of age group 5j on a series of dates] 



Date 



June 5. 

 June 7. 

 June 10. 

 June 13 

 June 16 

 June 19 

 June 22 

 June 24. 

 June 27. 

 July 1.. 

 July 5.. 

 July 8.. 



Males Females 



58.8 

 58.6 

 58.5 

 58.3 

 57.8 

 57.6 

 57.5 

 57.2 

 56.8 

 57.1 

 57.7 

 58.7 



57.0 

 56.9 

 56.5 

 56.2 

 55.9 

 55.5 

 55.4 

 55.3 

 55.4 

 55.5 

 56.0 

 56.6 



Date 



July 12. 

 July 14. 

 July 17. 

 July 20. 

 July 24. 

 July 27. 

 July 31. 

 Aug. 3.. 

 Aug. 7. 

 Aug. 10 

 Aug. 14 

 Aug. 17 



Males Females 



58.9 

 58.5 

 57.3 

 56.6 

 57.0 

 58.5 

 60.4 

 61.5 

 62.1 

 62.3 

 62.7 

 63.2 



56.8 

 56.0 

 54. 6 

 53.5 

 53. 7 

 55.2 

 57.3 

 58.7 

 59.4 

 59.8 

 60.3 

 59.8 



Date 



Aug. 21 



Aug. 24 



Aug. 28 



Aug. 31 



Sept. 4 



Sept. 8 



Sept. 11 



Sept. 14 



Sept. 18 



Mean 



Males Females 



63.6 

 63.8 

 63.8 

 63.9 

 64.1 

 64.1 

 64.1 

 64.3 

 64.3 



60.3 



60.7 

 60.7 

 60.7 

 60. 8 

 60.9 

 60.9 

 60.8 

 60.5 

 60.3 



57.7 



KARLUK RED-SALMON RUN OF 1924 



The two years mainly responsible for the run of 1924 were 1918 and 1919, each 

 of which had furnished a small or moderate pack of approximately 78,000 cases. 

 The 5-year and 6-year fish derived from these two brood years were in normal relative 

 numbers, the 5-year fish constituting 79 per cent of the run, the 6-year fish 17 per 

 cent. The remaining 4 per cent were largely 4-year fish of the 4 3 group. These 

 were grilse, largely males, which migrated seaward as fingerlings in the spring of 1923 

 and matured precociously as undersized fish of little value. 



The random sampling of this year was on a larger scale than heretofore, material 

 being obtained whenever possible on each day during the fishing season. The total 

 number of individuals thus obtained was 5,132, and these are distributed by age 

 group, sex, and length in Table 12, which follows. The age groups represented in 

 the run are essentially the same as those that appeared in 1922. A single group, 3 3 , 

 lacking in 1922, was represented in our 1924 samplings by a single specimen; while 

 two groups, 5 5 and 6 5 , each represented by a single individual in our 1922 material, 

 were not present in 1924. The groups 5 3 , 6 3 , and 6 4 again exceeded in numbers any 

 of the other groups present, and together constituted 92 per cent of the run. 



