428 THE KEEPERS BOOK 



requires some neatness and care, an enamelled cup may 

 be used to ladle out the eggs from the pails. If we are 

 working with glass grilles, no more ova must be placed 

 on each frame than will occupy exactly the available 

 space. Each little rack must contain its exact quota 

 of eggs, so that when the frames are filled all the eggs 

 will be uniform in rows, and all the rows uniform in the 

 box, with half an inch of water passing gently over them. 

 If we are using the perforated zinc baskets, each may 

 safely be filled with two or three layers deep of ova in 

 mass, but at least three-quarters of an inch of water in 

 this case must flow over the eggs. In these boxes, too, 

 the auxiliary sprays will now be carefully turned on so 

 that each jet falls into the centre of the opposite basket 

 in the box. Everything being now in order, water 

 taps all flowing freely, and all tackle put away, the 

 house may safely be locked up for the night, for the 

 labours of the day are satisfactorily ended. 



In water with a temperature varying from 40 to 

 45 F. about the thirtieth day the eyes of the embryo 

 fish may be seen, two little dark specks in the substance 

 of the egg. Trout may be expected to hatch out in 

 about seventy days altogether with water at the above 

 temperature, sea-trout in about ninety days, and salmon 

 in about one hundred and twenty days. All these 

 periods will be protracted in proportion as the weather 

 is colder, so that no anxiety need be feltat delay in hatch- 

 ing. Throughout this period of incubation nothing re- 

 quires to be done but to keep the water constantly 



