2GS 



SALMON OF THE KARLUK RIVER, ALASKA 



Table 25. — Percentage occurrence of varioiiS age groups in returns from escapements of the spring, 

 fall, and total run for the years 1920 to 1929, inclusive 



In figures 6 and 7 is presented the relationship between the percentage of fish 

 of a particular ocean history in the escapement and the percentage of fish of the same 

 ocean history in the return. In these and the following figures in this section, lines 

 purportedly fitting the data have been omitted intentionally. The two important 

 questions on which information is desired are (1) whether or not there is a correlation 

 between the percentage occurrence of a particular age group in the escapement and 

 the percentage occurrence of that same age group in the return, and (2) whether or 

 not the values fluctuate around a ratio of 1 to 1. To facilitate observation of the 

 second point, a line representing a ratio of 1 to 1 has been included in each figure. 



The relationship between the percentage of fish of a certain ocean history in the 

 escapement and the percentage of fish of the same ocean history in the return, may be 

 considered linear and is such that there will be approximately the same percentage of 

 fish of a- single ocean history in the return as there was in the escapement. There 

 appears to be a slight indication that the two-ocean fish are making up a lesser per- 

 centage of the returns than they did of the escapements and, conversely, that the 

 three-ocean fish are making up a greater percentage of the returns than they did of 

 the escapements, but the tendency is not marked and probably is not significant. 



