REARING 161 



weight of those above them, while at the same time 

 it reaches every egg, and furnishes a .fresh supply of 

 air to them all.' 



COLLECTION OF THE OVA 



Everything in the hatchery should have been 

 tested and got into thorough working order before 

 the autumn ; indeed, it is a good plan to keep the 

 water running through the hatching-boxes for several 

 weeks before the trays receive the ova. In this way 

 you will be enabled to detect any weak spot in your 

 arrangements, and to make sure that everything is 

 properly and permanently adjusted. Remember that 

 when once your eggs are laid down, any interruption 

 involving stoppage of the water supply will entail 

 damage if not disaster. 



The English trout is a winter spawner. But the 

 exact period at which the fish begin to spawn in any 

 given locality must be ascertained by observation 

 and enquiry on the spot. Much will depend on the 

 climate, the season and the condition of the water. 

 But at some time between the latter part of October 

 and the beginning of February the trout will be 

 observed working their way in pairs into the small 

 tributary streams, and into those parts of the main 



M 



