SEAWARD MIGRATION OF CHINOOK SALMON. 21 



Table 15. — Young Chinooks from Under the Cannery, Ilwaco, Wash., Sept. 17, 1914. 

 seven specimens tvathout intermediate growth. 



TWENTY-EIGHT SPECIMENS WITH INTERMEDIATE GROWTH. 



Seven specimens were collected from the Clackamas River near the hatcherj' on 

 October 13, 1915. These were obtained by hook and line fishing, and the collection is 

 too small and too variable to deserve detailed attention. The average length is 11 8 mm. , 

 and the average total number of rings on the scales, 21. Several show the primary 

 check, and one at least had apparently started a new period of vigorous growth. This 

 is indicated on the scales by a marginal band of five slightly wider rings. The scales of 

 all of the other specimens terminate in rings of the winter type. 



October 16, 1915, a collection consisting of 119 young chinooks was made at Point 

 Ellice, Wash. The total average length is 112. 7 mm. Sixty-one males average 112.2 

 mm. and 58 females 113.3 mm. Twenty-nine specimens (24 per cent) have a distinct 

 intermediate band at the margins of the scales. The scales of tlie remaining 90 speci- 

 mens terminate uniformly in narrow winter rings. The scales of a considerable pro- 

 portion show the primary check about 9 or 10 rings from the center. The following 

 table (16) presents the data. 



