216 THE "THROXG" migratory season. 



same epoch. But as it is not so — as ova are de- 

 posited and incubated during six months of the 

 year, the ages of salmon-fry must differ, and the 

 period of migration must extend more or less over 

 half the year. 'Tis true the "throng" time of 

 migration is from the middle of April to the 

 middle of May, because the "throng" spawning 

 season is between the middle of November and 

 the middle of December. If we allow, in conse- 

 quence of the low temperature of water in the 

 winter months, 140 days for incubation, its 

 "throno;" time will be between the middle of 

 April and May. Twelve months afterwards we 

 shall have smolts and s^eneral misrration of them : 

 but on that account let no one say that we shall 

 not have some smolts and some migration of them 

 in other months of the year. 



When salmon having spawned and, having be- 

 come " kelts," commence leaving for the sea the 

 upper stream of rivers they generally do so singly, 

 but when they have descended to the lower and 

 deeper parts of pools, and particularly when they 

 have reached the tidal ways they congregate in 

 small companies. When these bands of fish reach 

 the feeding-localities at sea, it is most probable 

 they again unite, and so companies become regi- 

 ments. These regiments are afterwards broken 



