96 FISH HATCHING. 



two black specks appear in the egg, which 

 are the eyes of the future fish, and you will 

 also see a faint line running around nearly 

 three-quarters of the egg, the body of the 

 future salmon or trout. When you see this, 

 congratulate yourself the egg is alive, and 

 will probably hatch out all right.* 



The time of the eye appearing, and of the 

 young fish hatching out, depends entirely 

 upon the temperature. 



It is a most curious thing to observe how 

 greatly temperature aflFects the development 

 of the ova into the young fish, and I look 

 upon this, not only as a most interesting 

 physiological phenomenon, but also as a 

 beautiful provision of nature, that the young 



* See drawing. 



