THE SCALES OF SALMON 103 



case of a Helmsdale fish which was marked on 

 December 12, 1904, when a kelt of 5 lb. weight. 

 The number of the mark was 1180 B, and other 

 particulars respecting it are given in the chapter on 

 marking (p. 65). The fish was recaptured, clean 

 and 14 lb. in weight, on April 30, 1906. 



I have included two photographs with which 

 Mr. Johnston has kindly supplied me, showing first 

 the scale at time of marking, and second the scale 

 at time of recapture. Horizontal lines have been 

 drawn to show the progressive development, and 

 each stage or interval has been lettered con- 

 secutively. In the photograph of the scale from 

 the kelt the history of the fish is at once seen. 



A. Parr and Smolt Stage, 1900-02. River. 



B. 1st Summer . 1902 ^ 



C. 1st Winter . 1902 I 



D. 2nd Summer . 1903 ( ^®*- 



E. 2nd Winter . 1903 J 



F. 3rd Summer (till 



May or June) 1904 River. 



The fish then spawned in the winter of 1904, and was 

 marked in December as stated. 



In the photograph of the scale from the same fish 

 on its recapture as a clean salmon we have, in 

 addition to the appearance already seen in the 

 smaller photograph, first the spawning mark on 

 recovery from the condition succeeding that shown 

 in F., and then two additional areas : — 



Gr. 5tli Summer . . 1905 Sea. 



H. 5th Winter . . 1905-6 Sea. 



The fish returned to the Helmsdale river in the 



