50 



40 



30 



20 



I 



r— r 



60 



o 50 



^ 40 



30 



20 



I- 



'2 '♦i 



1958 



1959 



3, 4, 4, 5, 5, 6, 6p 7, 7, 7-. 



'2 '+I '♦2 =1 -"2 °i 



2 '3 



86 



1958 



32 4| 42 5| 52 6| 62 7| 73 1-^ 



1959 



3, 4, 4, 5, 5, 6, 6, 7, 1, 1- 



2 "1 °2 '1 '2 '3 



32 4, 42 5| 52 6, 62 7| 7^ !■>, 

 GROUP 



Figure 4, — Age composition of king salmon commercial catch, Cook Inlet, 1958-59. 



The average length of all males measured 

 was 809 mm, in 1958 and 724 mm, in 1959, 

 whereas the average length of the females was 

 887 mm. in 1958 and 845 mm, in 1959, This 

 decrease in mean lengths in 1959 was due to a 

 greater proportion of younger fish. 



In 1958 and 1959 males decreased in average 

 length as the season progressed. Females 

 showed no such trend in the same years (figs, 

 6 and 7), An analysis of variance testing the 

 hypothesis that there were no significant dif- 

 ferences in the average lengths of males or 

 females from fishing period to fishing period 

 through June 1959 was made. Results of the 

 test were: for males F 



8,894 



= 9,804 and for 



females, ?__.,= 3,285. Since both "F" values 

 7,794 



were high, the analysis demonstrates that there 

 were significant differences between some or 

 all of the average lengths tested. No further 

 analysis was made to separate the differences, 

 as no explanation to account for such dif- 

 ferences can be made from the data on hand. 

 The mixing of stocks of fish in the commer- 

 cial fishery obscures any sequence of oc- 

 currence, if it exists. 



Length- Weight Relationship 



Lengths and weights were taken from 63 

 males and 81 females in 1959. The length- 

 weight relationship was analyzed for each 



