FISHERY BULLETIN: VOL. 70. NO. 1 



Table 3. — Percentage freshwater age composition of samples of sockeye salmon from 

 geographical areas of the North Pacific Ocean from those listed in Table 2. 



' The year selected is the most complete for that area, is in a series with adjacent areas, or is the only year a 

 sample is available in our series (Table 2). 



^ Historical data on age composition of samples from Ozernaya, Bolshaya, and Kamchatka Rivers, and Lake 

 Dalnee for a number of years from 1931 to 1960 are available in Hanamuro (1966). 



and maximum development (Adams, 1952; 

 Mortensen, 1947). (2) Positive prints of sec- 

 tions that showed the important features of 

 the anterior field of the scales were made from 

 these negatives on high contrast enlarging pa- 

 per. (3) The positive prints of the scale sec- 

 tions were assemV)led by area groups on mount- 

 ing sheets and photographed to provide the 

 plates. The scales were all photographed at 

 the same magnification. Consequently, the rel- 

 ative size of the scale features on the plates 



reflects the relative size of the scale features 

 themselves. 



As indicated in my previous paper (Mosher, 

 1968), the texture, contrast, and distinctness of 

 circuli vary greatly both on individual scales and 

 between the scales of the same and different fish. 

 Some scales can be photographed to show the 

 features clearly; other scales, especially from 

 some localities with many closely spaced and 

 broken circuli, do not provide clear photographs 

 of all features. 



146 



