110 



AMERICAN FISH CULTURE. 



The figures on this and the opposite page exhibit the 

 growth of the young salmon db ovo. No. 1 is the egg; 

 No. 2, the fish when it casts off the shell ; No. 3, after the 

 umbilical sac is absorbed; No. 4, the size when three 

 months old; No. 5, when five months; No. 6, when ten or 

 eleven months old; and No. 7, when it puts on the silvery 

 vesture of the smolt and is ready for its first migration to 

 sea. Figures 5, 6 and 7 represent the growth under favor- 

 able circumstances, and of such as go to sea the second 

 summer, when somewhat over a year old. Experiments in 

 Scotland and Ireland have shown that only a portion of the 

 fry become smolts the second summer, the remaining por- 

 tion, which is about half, not arriving at that state until 

 another year has elapsed. It was supposed at one time, by 

 those who conducted the salmon-breeding establishment at 



