92 Salmon at the Antipodes. 



CHAPTER XIII. 



FISH-HATCHING IN A CUEEENT OF WATER. 



The natural way in which the eggs of trout 

 and salmon are hatched, is by the action of a 

 current of water flowing over them, and the 

 ova of the salmon, salmon trout, and sea trout, 

 as well as of all the other varieties of river and 

 lake trout, are deposited by the parent fish in 

 natural gravel beds in shallow parts of the 

 streams and rivers, where the current runs 

 swiftly. In cold latitudes, where the rivers 

 are often frozen over in winter, the shallows 

 having a rapid current are seldom frozen, and 

 the constant supply of atmospheric air neces- 

 sary, as well to the development of the ova as 

 to the existence of the fish, is kept up by the 

 running water, which by rippling over the 

 rapids gets aerated, and maintains the neces- 

 sary supply of oxygen, which is obtained from 



