THE HATCHING OF OTA. 93 



the isolation of species is complete. But where the 

 rearing is perforce conducted in indoor trays, diffi- 

 culties such as I have described will be experienced, 

 if the operations are at all on a large scale, and the 

 ■water supply is limited. The fish being deposited, 

 Kttle now needs to be done with them. They will 



1. Egg with eye of embryo visible. 



2. Young aalmon just hatched. 



S. Salmon having absorbed the vesicle. 

 4, Salmon three or four months old. 



burrow under the gravel, or under stones, getting out 

 of sight, and out of the light, which suits them not,i 

 as much as possible, gradually absorbing the large 

 bladder which attaches to them, the contents of 

 which affords their sole subsistence. In about six 

 weeks, as they grow larger, you will have to remove 

 a large portion of them to some other tray that they 

 may not be overcrowded. Little by little, the bladder 

 is drawn up and absorbed into the system; as it 



i A slight awning over them as a shade is desirable. 



