THE SCALES OF SALMON 103 
ease of a Helmsdale fish which was marked on 
December 12, 1904, when a kelt of 5 lb. weight. 
The number of the mark was 11808, 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. ist Winter ¢ 1902 
D. 2ndSummer . 1903 Bea 
E. 2nd Winter ‘ 1903 
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 :— 
G. 5th Summer - 1905 Sea. 
H. 5th Winter p . 1905-6 Sea. 
The fish returned to the Helmsdale river in the 
