REARING 195 



to escape but not the fish. During this operation the 

 lower end of the syphon should be kept immersed. 



It is a quaint sight to see the unwilling fry 

 disappearing (always tail first) up the syphon and 

 excitedly reappearing, again tail first, in the vessel 

 below, none the worse after their first journey at rail- 

 way speed through the unfamiliar dark tunnel. 



In the outdoor rearing-boxes feeding will be con- 

 tinued as before in the hatching-house. The mouth 

 of each fish, however, is daily growing larger and its 

 digestion stronger. Soon, therefore, the very fine 

 /Jnc feeding cylinder should be changed for one 

 with larger perforations (known as No. 6), which will 

 allow more substantial morsels to pass through. The 

 zinc of the box sieve will, of course, undergo a cor- 

 responding change. ' Shade,' says Livingston Stone, 

 ' never killed a trout yet, young or old ; sunlight has 

 killed a great many.' For this reason keep the lids 

 of the rearing-boxes at first always closed on both 

 sides when you are not attending to them. Gradually, 

 however, the fry should be accustomed to more light 

 by way of preparation for the time when they will be 

 turned out ; and here it is that you will realise the 

 advantage of having the lid of each rearing-box 

 divided into two independent halves ; for by opening 

 only that half which is farthest from the sun you can 



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