H2 Salmon at the Antipodes. 



ice, or some other means of preventing the 

 injurious effects of the shock caused by a 

 sudden change of temperature. Then the ova 

 may be distributed equally in the boxes, and 

 a small stream of water turned on, to bring up 

 the temperature by degrees to that of the 

 water in which they are to be hatched. It is 

 very dangerous to expose the ova to dry air of 

 a high temperature, and they should be placed 

 in the hatching-boxes, moss and all, as the 

 moss can be easily picked out afterwards. 

 Care must be taken not to keep them for any 

 great length of time in still water, as it is likely 

 to kill the embryo, and where water is abun- 

 dant, a good current should be maintained. A 

 stream of 15 or 20 pints per minute would 

 serve to hatch 50,000 ova, with an occasional 

 shower from the watering-pot ; and the water 

 should be made to fall some distance, or be 

 forced through a small aperture under pres- 

 sure, to aerate it thoroughly. With a stream 

 of four or five pints per minute, 1000 ova may 

 be hatched, or even two or three times that 

 number. But much depends on constant 

 care and attention to minute details, which 

 readily suggest themselves to the attendant. 



