102 FISH HATCHING. 



however for an axiom, that the higher the 

 temperature for the egg the weaker the 

 fish produced from that egg, anything 

 above 50 is weakening. 



The first fish again hatched out from a 

 batch are the weakest, the last are the 

 healthiest ; when however they once begin 

 to hatch they will come out all in a mass, 

 two, three, or four thousand of a morning. 

 The proper temperature for trout and salmon 

 eggs is 40 to 45, and again I repeat it, any- 

 thing over 50 is weakening. 



Grayling, however, appear to be an excep- 

 tion to this rule ; Mr. Ponder has obtained a 

 fair supply of the ova of these fish, which 

 the Thames Angler Preservation Society are 

 about to introduce into the Thames. The 

 quantity obtained amounted to between 



