12^ FISH CULTITRE 



but it is not well to keep the temperature of tlie 

 house very high, because it has a tendency 

 to raise the temperature of the water. 



It will also be well to have a small building 

 with plenty of shelving attached to the hatch- 

 ing-house as a sort of workshop and a place in 

 which to keep the smaller implements and in 

 which to make the liver paste. The wisdom of 

 such a building will be apparent at once to any 

 one who has had anything to do with rearing 

 fish, or remembers how things will accumulate 

 and get in the way of the workmen, or become 

 lost, when there is no set place for them. 



Absolute cleanliness in the hatching-house is 

 very necessary. Carelessness in this respect 

 may cause trouble and loss of fish. It must be 

 remembered that impurities in the water are as 

 fatal to trout as filth is to human beings. 



It may in some cases be impracticable or 

 not desirable to set the troughs in two or more 

 tiers, in which case the hatching-house may be 

 32 feet wide with two sets of supply troughs, 

 one on each side of the house, each trough being 

 14 feet long; or a house may be 20 feet wide, 

 with one set of troughs each 16 feet long. The 



