The Salmon 
a new era begins. They become covered with silvery scales, their 
9 
J 
tails lengthen and become forked, and their fins are enlarged. This 
River Dochart, September 1906. 
life size. 
Salmon Parr, 
3. 
FIG. 

change is quite a rapid one, the fish collecting in shoals during the 
process. As the season advances the true smolt stage is reached, and 
the migratory period begins. In large rivers the descent is made at 
any convenient time, but in small streams they can only descend during 
