Table 4. --Number and Percentage of 3-, 4-, and 5-year-old chum salmon 

 in three time periods in catch, Alaska Peninsula, 1951-57; Kodiak Island, 

 1948-51, 1955-57; Prince William Sound, 1952-53, 1956-58 



Prince William Sound spawning grounds. Helle 

 (I960)* compared early and late spawning runs 

 and found that in both, fish in age class 5 were 

 most abundant in the initial stages of the runs, 

 and fish in age class 3 became more abundant 

 as the season of the runs advanced. 



periods in table 6. It was in favor of males 

 early in the season and decreased slightly as 

 the season progressed. The situation was the 

 same in all three areas, although data taken be- 

 fore July 1 in the Kodiak Island and Prince Wil- 

 liam Sound areas are too few to be dependable. 



* Helle, John Harold. 1960. Characteristics and struc- 

 ture of early and late spawning runs of chum salmon, 

 Oncorhynchus keta (Walbaum), in Streams of Prince 

 William Sound, Alaska, M^. Thesis, University of 

 Idaho, 53 p. 



Interarea Variability- 

 Length. — In figure 4 the mean lengths of 

 age classes 3, 4, and 5 are plotted by area 

 to permit an evaluation of length with age. The 



