52 



BULLETIN OF THE BUREAU OF FISHERIES 



Table 17. — Karluk red-salmon run of 1925. Average lengths and weights of age group 6) throughout 



season 



Date 



June 18 



June 20 



June 22 



June 23 



June 24 and 27 



June 20 and 29 



June 30 and July 



July 13 and 14 



July 15 and 16 



July 17 and 18 



July 20, 22 and 23... 



July 21 and 25 



July 27 and 28 



July 29 and 30 



July 31 and Aug. U. 

 Aug. 3 and 4 



i Second sample 



Centimeters 



Males 



Fe- 

 males 



57.1 

 57.0 

 57.1 

 57.0 

 56.7 

 56.7 

 57.3 

 58.1 

 58. 8 

 59.1 

 59.4 

 59.9 

 60.1 

 60.3 

 60.4 

 60.6 



Hectograms 



Males 



23.8 

 23.8 

 23.2 

 22.9 

 22.2 

 22.4 

 23.2 

 25.5 

 27.3 

 28.1 

 28.1 

 28.3 

 28.8 

 29.3 

 29.5 

 29.6 



Fe- 

 males 



20.7 

 20.7 

 20.6 

 20.5 

 20.2 

 19. 8 

 20.8 

 21.9 

 23.2 

 23.6 

 24.0 

 24.4 

 24.7 

 25.1 

 25.2 

 25.4 



Date 



Aug. 5 and 6__ 

 Aug. 8 and 10- 

 Aug. 11 and 12 

 Aug. 13 and 14 

 Aug. 15 and 17 

 Aug. 18 and 19 

 Aug. 20 and 21 

 Aug. 22 and 24 

 Aug. 25 and 26 



Sept. 7 



Sept. 7 i 



Sept. 8 



Sept. 9 ~- 



Means. . 



Centimeters 



Males 



63.7 

 64.0 

 64.2 

 64.5 

 64.4 

 64.6 

 64.7 

 65.2 

 65.2 

 65.1 

 65.4 

 65.4 

 65.3 



62.8 



Fe- 

 males 



60.7 

 60.8 

 61.1 

 61.3 

 61.5 

 61.7 

 61.9 

 62.0 

 61,9 

 61.9 

 61.9 

 61.8 

 61.8 



59.9 



Hectograms 



Males 



29.4 

 29.8 

 30.1 

 30.4 

 30.2 

 30.6 

 30.7 

 31.4 

 31.4 

 31.8 

 31.8 

 31.8 

 31.7 



Fe- 

 males 



25.4 

 25.6 

 25.7 

 26.0 

 26.4 

 26.6 

 26.7 

 26.7 

 26.8 

 26.6 

 26.6 

 26.5 

 26.6 



28.2 



24.2 



KARLUK RED-SALMON RUN OF 1926 



The 1926 run has been investigated on the basis of daily sampling, in so far as 

 this proved practicable. Little or no material could be obtained during periods 

 closed to commercial fishing, so the record is incomplete prior to June 15, as well as 

 during week ends throughout the season. The earliest example is dated May 24 

 and the latest September 14. There are 66 samples, taken on different days, and 

 these contain records of 8,172 individuals. Of these, 78.6 per cent belong to the 5 3 

 group, 9.1 per cent to the 6 4 group, and 5.8 per cent to the 6 3 group. By age, irre- 

 spective of group, our samples contain 81 per cent in their fifth year, 15 per cent in 

 their sixth, 3 per cent in their fourth, and 1 per cent in their seventh year. 



The principal brood years for this run, therefore, were 1920 and 1921, the progeny 

 of these two years forming 96 per cent of the run. Concerning 1920, we have little 

 information beyond the size of the commercial catch, which was approximately 

 100,000 cases. In 1921 there were approximately 1,500,000 spawners. The very 

 large run of 1926, when commercial catch and spawning escapement together aggre- 

 gated some 4,500,000 red salmon, can properly be attributed to the fact that it had 

 for its two principal brood years 1920 and 1921, with their large spawning reserves. 

 The crowded condition of the spawning beds in 1921 was notable; but in spite of 

 the destruction of eggs, when nests were dug up by a succession of spawners, the 

 resulting brood brought to maturity in 1926 some 3,500,000 5-year fish. When this 

 sum shall have been augmented by the number of 6-year fish that will presently 

 appear in the run of 1927, the showing should be a very favorable one. 



In Table 18 we present an analysis of the run based on our series of samplings. 

 Representatives of 14 age groups were present, including several 6 5 's and 7 6 's, which 

 had not appeared in previous years. We note also that the 4 2 's and 5 2 's, which 

 develop from fingerlings (usually not numerous) that migrate seaward in their 

 second year, were present in disproportionately large numbers. 



