Table 1. — Nushagak District red salmon catch and escapement sampling effort, 



1946-59 



The following data were 

 cards: 



punched on IBM 



1. The total catch of the season, 



2. The total catch of each fishing period. 



3. The combined unweighted sex ratios 

 taken in each fishing period. 



4. The combined unweighted length fre- 

 quency curves of both males and females from 

 each fishing period. 



5. The percentage age composition deter- 

 mined for each period. 



In order to facilitate calculation with these 

 data, a program was written for the IBM 709 

 computer whereby the following information 

 could be obtained directly: 



1. Unweighted, weighted, and cumulative 

 weighted length frequency curves for the entire 

 season by sex. 



2. Number of males and females caught 

 in each fishing period and in the entire season. 



3, Number of fish caught within each 

 age group. 



Basically, spawning ground measurements 

 were treated in the same way. Consequently, 

 the same IBM program was applied to the 

 spawning ground measurements. Finally, the 

 commercial catch and the escapement data 

 were combined into a weighted length fre- 

 quency curve for the entire run by sex, the 

 sex ratio for the entire run, and the number 

 of fish of each sex for each age group. 



Certain deviations from the methods de- 

 scribed for treating the basic data became 

 necessary at times. For example, for two 

 fishing periods the catch was known only by 

 weeks, and the weighting had to be done on 

 a weekly basis. At other times no sample 

 was taken from one particular fishing period, 

 and the catch for the period in question was 

 combined with that of the previous or follow- 

 ing period. Frequency distributions obtained 

 applied to the combined periods. 



