CHAPTEE Vn 



TEOUT PONDS AND HOW, TO BUILD 



THEM 



One vital requirement in selecting a site for 

 a trout-breediag establishment is that water 

 can be carried into the hatching-house at such 

 a height as to permit a flow through the 

 troughs, allow drainage from the building and 

 at the same time supply the ponds. There must 

 therefore be some fall of land away from the 

 spring or intake. 



The degree of fall needed depends on how 

 the troughs are to be set in the hatching-house, 

 and the manner of building the ponds. If only 

 one row of troughs is to be used, a decided pitch 

 is immaterial because they may be placed upon 

 the floor, in which case a fall of two feet will 

 be sufficient; for troughs in two tiers, 3% feet 

 from the flow will meet the requirements ; if the 

 water is to be used three times, by employing 



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