Sex ratios were calculated as percentages. 



The data, set up in standardized format, are 

 arranged to provide the original material for 

 analysis and reference in this report as appen- 

 dixes A, B, and C. They are organized as 

 follows: 



1. A chronological tabulation of scale sam- 

 ples, giving each a number for convenient 

 reference and showing the date, location of 

 sample, gear used, and number of measure- 

 ments and scale samples obtained (appendix 

 tables A-1, B-1, C-1, C-2). 



2. A map of each area showing localities 

 where samples were taken (appendix figures 

 A-1, B-1, C-1, C-2). 



3. A frequency tabulation to the nearest 

 half centimeter midpoint for all lengths having 

 corresponding ages by age and sex. All fish 

 less than 500 mm. and more than 749 mm. 

 are grouped, because they make up insignificant 

 numbers of the total (appendix tables A-2, B-2, 

 C-3, C-4). 



4. The sex ratio of all samples (appendix 

 tables A-3, B-3, C-5, C-6). 



In the Prince William Sound area, streams 

 where spawning ground samples were taken 

 are designated according to the time of their 

 runs--early, middle, or late. Noerenberg clas- 

 sifies Prince William Sound streams as 

 follows: early runs peak between July 15 and 

 August 5, middle runs between August 6 

 and 20, and late runs between August 21 and 

 September 10.' 



of the year, time of season, or source of the 

 sample. In using the combined yearly data, two 

 points were considered: types of gear used and 

 the treatment of the spawning ground samples 

 from Prince William Sound. 



Gill nets are usually considered to be 

 selective for size and sex. In our samples 

 from gill nets, ages and lengths were dis- 

 tributed within about the same limits as in 

 samples from traps and seines, and separating 

 the data by type of gear did not appear justified. 

 Usable data from the Prince William Sound 

 commercial catch and spawning grounds were 

 obtained in only 3 years. The mean lengths of 

 4-year-olds (table 1), the dominant age class, 

 were similar; and no directional bias was 

 evident between catch and spawning ground 

 samples. Because of the similarity in lengths, 

 all of the samples from Prince William Sound 

 were used for comparisons with other areas, 

 even though in some years samples were 

 exclusively from the commercial catch 

 and in some, exclusively from the spawning 

 grounds. 



In contrast to the similarity in length, the 

 age compositions of samples from the catch 

 and spawning grounds were not sufficiently 

 alike to permit grouping. In table 2 age 

 composition samples for 1952, 1953, and 1956 

 are combined by sex. The percentage of 3-year- 

 olds in the catch is about three times that on 

 the spawning grounds, and the percentage of 

 5-year-olds in the catch about half that on the 

 spawning grounds. This approximate relation- 

 ship prevailed in all 3 years having comparable 

 data (appendix tables C-3 and C-4). 



Since sampling was not complete or con- 

 tinuous for any one year or series of years, 

 the general relationships of length with age 

 were studied by combining all length measure- 

 ments by age classes for each area irrespective 



'Noerenberg, W. H. 1954. Prince William Sound 

 spavming ground survey, 1954. University of Washington, 

 Fisheries Research Institute, Circular No. 69, 19 p. 

 [Duplicated.] 



Changes in length composition were studied 

 through the mean lengths of 4-year-old fish, 

 grouped according to sex. Only 4-year-olds, 

 the dominant age class, were studied, since 

 changes in mean lengths of 3- and 5-year-olds 

 varied in the same way as 4-year-olds. Changes 

 in age composition were studied as numbers 

 and percentages of fish occurring in the three 

 age groups. Sex ratios were determined from 

 entire samples. 



