[fraser] 



PACIFIC SALMON 



187 



average growth for the last summer of the 4-year class was 3 • 3 inches. 

 The growth of the last summer of the 5-year class was small, only 1-3 

 inches on the average. There is no material difference in the growth 

 of the 4-year and the 5-year fish to the end of the third year. It must 

 be remembered that 5-year fish taken on 1916 were from eggs liberated 

 in 1911, and the 4-year fish in the following year, hence size cannot be 

 a determining factor in the date of maturity. 



The length at the end of the second year varies from 7-8 to 10-8 

 and at the end of the third year from 16-3 to 21-0. At the end of 

 the fourth year the range is from 21-7 to 25-6, with an average of 

 23-3 in the 5-year class and of 22-2 in the 4-year class. The total 

 length of the 5-year class varies from 22 -0 to 27 -0 with an average of 

 24-6. 



The average length of the males in both the 4-year and the 5 -year 

 classes is slightly in excess of the average for the females as the fol- 

 lowing table shows, although the largest fish obtained was a female. 



