TEOUT 



the young fish hatch out, when the ova are not 

 in the most delicate stage. 



It is of the greatest importance that every- 

 thing should be ready for the ova long before 

 they are expected, as hurry and new apparatus 

 are likely to cause failure. Any concrete and 

 varnished or enamelled woodwork should be ex- 

 posed to the action of a current of water for at 



least five or six weeks before they are brought 



* 

 into actual use. 



The choice of a suitable spot in which to make 

 his hatchery is a serious point for the considera- 

 tion of the amateur. A spring is the best water 

 supply as a rule, for the water is usually of a fairly 

 even temperature, and does not require filtering, 

 but water from a stream where trout are known 

 to live is quite safe. A few years ago it would 

 have been necessary for any one wishing to take 

 up fish culture, to erect a building in which to 

 place his hatchery if he intended to hatch any 

 number of eggs, in order to guard against frosts. 

 At the present time, the eyed ova of even the 

 brown trout (Salmo fario) can be obtained suffi- 

 ciently late to be safe against a frost severe 

 enough to cause any damage, and as the rainbow 

 trout (Salmo irideus) spawns in February and 



21 



