KARLUK RiVER RED-SALMON INVESTIGATION 



Table 16. — Karluk red-salmon run of 1925. Percentages of each age group in random samplings 



taken throughout the season 



Date 



June 1 



June 18 



June 20 



June 22 



June 23 



June 24 and 27 



June 26 and 29...... 



June 30 and July 1_. 



July 13 and 14 



July 15 and 16 



July 17 and 18 



July 20, 22, and 23.. 



July 24 and 25 



July 27 and 28 



July 29 and 30 



July 31 and Aug. 1. 



Aug. 3 and 4 



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. - 



Sept. 8 



Sept. 8 - 



Age groups 



1.0 



5.0 

 1.7 



1.3 

 4.0 



1.0 



0.5 



.5 

 1. 1 

 1.0 



1.0 



1.0 



To" 



.5 

 3.0 



69.0 

 79.0 

 03.0 

 73.0 

 66.0 

 68.0 

 71.0 

 71.0 

 73.0 

 65.0 

 70.0 

 73.0 

 65.0 

 68.0 

 73.0 

 77.0 

 86.0 

 66.0 

 77.0 

 74.0 

 78.0 

 75.0 

 68.0 

 74.0 

 72.0 

 68.0 

 58.2 

 52.5 

 50.0 

 47.4 



0.5 



1.0 

 1.0 

 .5 



1.0 



1. 5 

 2.0 

 .4 

 2.0 

 3.0 

 8.2 

 4.0 

 8.3 

 9.5 



27.0 

 16.0 

 21.0 

 12.0 

 13.0 

 15.0 

 12.0 

 9.0 

 5.0 

 3.0 

 3.0 

 2.0 

 1.0 



1.3 

 .9 



1. 5 



3.0 

 .4 

 .9 

 .5 

 .5 



1.0 

 .4 



2.0 

 2.0 

 9.0 

 7.0 

 11.0 

 6.0 

 8.0 

 8.0 

 12.0 

 27.0 

 18.0 

 21.0 

 30.0 

 24.0 

 20.0 

 18.0 

 10.0 

 27.0 

 15.0 

 11.0 

 14.0 

 13.0 

 18.0 

 16.0 

 16.0 

 18.0 

 24. 5 

 26.3 

 30.0 

 37.9 



0.8 



1.0 



.5 

 .5 

 1.0 

 1.0 

 .5 

 .5 

 .7 



.4 



.5 

 .4 

 1.3 

 1.8 

 .5 



The age group 5 3 , which at all times constitutes the majority of the run, affords 

 a striking example of the increase in length and weight that occurs among its members 

 during the season. The first individuals to appear in the run have registered no 

 growth of the current year on the margins of their scales, which are occupied by the 

 terminal check of the preceding fall and winter. Among later arrivals, the new growth 

 of the year begins to appear in the form of one or two strong, widely separated 

 circuli, which contrast strongly with the fine crowded lines of the winter check, 

 which they surround. These broadly spaced summer rings increase in number 

 among the individuals of the run as the season advances, until at the close of the 

 summer all scales are marked by a well-defined marginal band of broadly spaced 

 rings. Still later, in the fall, these may, in turn, become margined by a few narrowly 

 spaced rings, the beginning of the fall-winter check of the current year. 



This regular growth during the season is well shown in Table 17, which gives 

 for the principal age group (5 3 ) the average lengths and weights of males and females 

 throughout our series of samples. In the series of June averages (as was the case 

 in 1922, but not obviously in 1924) can be noted a slight progressive decrease in 

 both males and females, registered in both lengths and weights. The increase 

 begins with the first of July and proceeds without interruption until September. 

 The question of the adequacy of our samples receives favorable testimony in the 

 close correspondence of males and females throughout the series of their fluctuations, 

 and also in the strict parallelism in average lengths and weights when even minor 

 changes are in question. Each of the four series in Table 17 has been smoothed once 

 by threes. 



