ARTIFICIAL BREEDING OF SALMON. 201 



released into the tub of water 'from which she was 

 taken. The dish, by the way, must previously have 

 been nearly filled with water. Before operating on 

 the male fish, the water from the dish had better be 

 drained off, and fresh poured in. The male fish is then 

 taken and handled in the same way. A small quantity 

 of milt, just sufficient to discolour the water after being 

 gently stirred with the fingers, is sufficient. It is then 

 put back again into the tub, and while the female 

 is again being brought out, the contents of the dish 

 are to be emptied into another tub half filled with pure 

 water. When all the roe has been pressed out and 

 fructified as before with the milt, and again emptied 

 into this tub, the water is allowed to run out through 

 a hole previously bored in the side about an inch above 

 the bottom. By the motion of the water running out, 

 all the eggs will be brought into contact with the milt. 

 In about five or ten minutes the ova can then be 

 removed into the hatching-boxes. 



If the eggs are in a fit state, the very smallest 

 pressure is sufficient to squeeze them out ; and it has 

 been found that with due care the female suffers no 

 injury from the manipulation, and will be as fruitful the 

 following year as ever. 



The unfruitful eggs after they have been some time 

 in the hatching-boxes will be covered with a peculiar 

 parasitical plant, " Leptomitus clavatus" which gives 



