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happened to the fry, with the result that the numbers of smolts and 

 parr were greatly reduced. Those remaining had more feeding 



than usual, consequently a 

 greater proportion became 

 smolts the first year, many 

 of them being eight times 

 the weight of those that re- 

 mained parr. Fig. 139 shows 

 two of the same age the one 

 8 oz., and the other i oz. The 

 larger one became a smolt when 

 one year old, and the smaller 

 was just assuming the smolt 

 stage when two years old. The 

 larger one, too, had a greater 

 number of rings on its scales 

 than the other. If these smolts 

 are prevented from going to 

 the sea, they develop ova and 

 may spawn on more than one 

 occasion, but their growth is 

 greatly retarded. A smolt 

 thus imprisoned usually weighs 

 at the end of the first year 

 from 6 to 10 oz. ; at the end 

 of the second, from 10 to iS 

 oz. ; and at the end of the 

 third year, from 18 to 32 oz. 

 A smolt four years old can thus 

 be 2 Ibs. in weight if it has 

 remained all its time in fresh 

 water. (See illustrations of smolts at different ages and of different 

 weights.) Smolts so confined become very restless, moving rapidly 

 through the water and leaping high into the air. Several I had con- 



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