284 



SALMON OF THE KARLUK RIVER, ALASKA 

 Table 33. — Data for the 1929 marking experiment 



EXPERIMENTS IN 1930 



Three marking experiments were carried on simultaneously (tables 34-36). 

 Although the experiments were simultaneous they have been designated first, second, 

 and third for reference purposes and to provide for facility in discussion. 



In the first experiment (table 34), 25,000 seaward migrants were marked by ampu- 

 tation of the adipose and right ventral fins, 631 of these were recovered, and a calcu- 

 lated total of 5,177 fish returned (20.7 percent). 



In the second experiment (table 35), 25,000 seaward migrants were marked by 

 amputation of the adipose and left ventral fins, 666 of these were recovered, and a 

 calculated total of 5,350 marked fish returned (21.4 percent). Two marked fish of the 

 7 3 age group were recovered, but according to the data, no fish of that age group were 

 examined or were present in the return from the migration. The 7 3 age group, un- 

 doubtedly, was present among the fish examined, but its numbers were so few that 

 representation was not afforded in the samples from which scales were secured for 

 age determination. 



Table 34. — Data for the first 1930 marking experiment 



