SEAWARD MIGRATION OP CHINOOK SALMON. 



55 



Mch. ^pr. May June Jultj ^ug.^ept. Oct. Nov. Dec. Jan. Feb. Mch. Apr. Maj xTune 

 Fr^. Yggrlliiga. 



Graph 4.— Columbia River (group i ): Rate of growth, increase in number of rings, and increase 

 in length of anterior radii of scales. Figures at left of graph indicate ordinate values for the 

 three types of curves, as follows: (i) For curve of length, cmtimettrs: (2) lor number of rings, 

 ordi>2ary numerical values: (3) for length of anterior radii, arbitrary units (.actual value, o.ooS}4 mm.). 

 Solid line indicates length of— i, specimens without intermediate growth; and 2, specimens 

 with intermediate growth. Broken Une indicates number of rings on the scales— i, to inter- 

 mediate growth; 2, total for specimens without intermediate growth; and 3. total for specimens 

 with intermediate growth. Dotted line indicates length of anterior radii— i. to intermediate 

 growth; 2. total for specimens without intermediate growth: and 3, total for specimens with 

 intermediate growth, a indicates collection from Columbia River near mouth of Little White 

 Salmon River. 



