A STUDY ON TROUT AND YOUNG SALMON. 



October 18, 1901. These are thus at least 2V2 years old. The 

 upper one of the two groups denoted by broken lines, repre- 

 sents the estimated size of these same salmon during the first 

 autumn in the aquaria, when their size could not of course be 

 measured. 



Fig. 2. 



Further, as a gap then exists between 30 and 40 cms., a gap 

 of such a size that a group evidently must exist between these 

 sizes, I have drawn a curve in broken lines representing such 

 a group about the sizes found in the young salmon caught by 

 the mackerel fishermen in the Scagerrack and forwarded to me 

 during May and June. 



For clearness I have provided the different groups with 

 current dates. 



