The Salmon 



a new era begins. They become covered with silvery scales, their 

 tails lengthen and become forked, and their fins are enlarged. This 



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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 



