frequency data. This was done in the following 

 manner: 



1. Scales collected from the catch were 

 read in a routine manner. Length frequencies 

 of age groups .2 and .3' were tallied, and a 

 dividing line between these two size groups 

 was determined. This was done each year for 

 each sex. This dividing line was applied to the 

 total season's weighted length frequency for 

 the catch in order to arrive at the percentages 

 of small and large size groups of fish. 



2. For the escapement, the dividing line 

 was ascertained from the length frequency 

 itself, which then gave percentages of small 

 and large size groups, 



3. The scale readings for each fishing 

 period were weighted by the fraction of the 

 total catch in the period and summed in order 

 to calculate season values for percentages of 

 the fresh-water age groups within each of the 

 two marine size groups. Males and females 

 were combined. 



4. The percentages of the age groups 

 within each marine size group were then ap- 

 plied to the catch, as well as to the escape- 

 ment, to calculate the number of fish for 

 each age. 



This method assumes that the fresh-water 

 age composition within each ocean age group 

 is the same in the escapement as in the catch. 

 This assumption finds support in the fact that 

 fresh-water age has no detectable relation to 

 size at return, which would mean that the gill 

 net fishery has little differential selectivity on 



' In designating age groups, Arabic numerals are 

 used to represent numbers of annuli, and a dot to dif- 

 ferentiate fresh-water and salt-water growth. An Arabic 

 numeral followed by a dot designates fresh-water annuli, 

 and Arabic numeral preceded by a dot designates salt- 

 water annuli. 



fish of different fresh-water ages that are of 

 the same ocean age. 



ORGANIZATION OF THE TABLES 



The extent of sampling done each year is 

 given in table 1. Basic data on number of 

 salmon in catch and escapement are contained 

 in tables 2 and 3, followed by summaries of 

 the weighted length frequencies for males and 

 females in catch, escapement, and total run 

 (tables 4-9). Seasonal sex ratios in catch and 

 escapement are found in table 10, and the 

 numbers of males and females in table 11. 



Table 12 gives the percentage distribution 

 for males and females in catch and escape- 

 ment according to ocean age, while table 13 

 gives the same information expressed in 

 numbers. 



Table 14 contains a breakdown of percent- 

 age age distribution within the two ocean age 

 groups and with males and females combined. 

 The salmon returning in each year within 

 different age groups are given in table 15, 

 and the number of 4-, 5-, and 6-year fish 

 returning from a given year of spawning is 

 contained in table 16. 



In table 17 the return is distributed by 

 ocean age groups. Table 18 contains the total 

 return of all ocean age groups from a given 

 year of spawning. 



A further refinement is achieved in table 19 

 with the total return from a given smolt mi- 

 gration given by individual age groups. Table 

 20 contains the same compilation on a per- 

 centage basis. In table 21 the return of adult 

 red salmon per smolt migration inu-x point 

 is calculated. 



Finally, the fishing periods for the years 

 1946-59 are shown as calendar charts on 

 pages 25-31. 



