98 VERMONT AGRICULTURAL REPORT. 



in working over the eggs or fry. No artificial heat is necessary 

 in a hatchery supplied with spring water, but if the water gets 

 below 36 degrees in temperature, artificial heat may be neces- 

 sary to prevent its freezing over the surface in the troughs. 

 There is no objection to artificial heat for personal comfort. 



In selecting a site for a hatchery, place it far enough from 

 the intake to secure a fall of five or more feet to the floor of 

 the building. The object of this is to raise the troughs about 

 two feet from the floor for convenience in working over them. 

 Bear in mind the heavy snows of winter and high waters, that 

 the building may not be inundated. 



HATCHERY BUILDING. 



A simple house may be built at small expense with a plain 

 shed roof. Use rough boards, 12 inches by 1 inch, and cover 

 joints with 3 inch by 1 inch battens. The roof should be made 

 water tight. There should be a drain underneath the building 

 to conduct the water from the waste pipes. The outside should 

 be well drained around the bottom. A building 16 ft. by 9 ft. 

 will accommodate a pair of troughs 12 ft. long placed side by 

 side in the center and one additional trough against the walls 

 on each side. 



EQUIPMENT. 



Figure 1 shows the arrangement of troughs in pairs, side by 

 side. Figure 2 shows how the troughs could be arranged so that 

 the second trough would utilize the same water as the first one. 

 In large hatcheries the troughs are frequently set in pairs, each 

 pair emptying into a second pair to economize water and space. 

 These troughs can be made of any good sound lumber ; pine is 

 preferable. If there is to be but one or two troughs, the supply 

 trough, B, can be made out of half a kerosene barrel, burned 

 out, with spigots inserted the same as in supply trough, figure 

 1. The supply trough should be arranged with an overflow to 

 carry off surplus water as in an ordinary watering trough or by 

 a dam, e, figure 1, the upper edge of which is one inch below 

 the top of the supply trough. To regulate the supply of water 

 flowing into the hatching troughs a simple arrangement is 

 shown in the water gate, c, and Figure 3. Make the waste 

 pipe, f, larger than the supply pipe. If this waste pipe is ex- 

 tended through the bottom of the supply trough to within an 

 inch of the top it will take the place of the dam, e. The plan 

 shown in figure 1 is designed to show a more elaborate supply 

 trough which can be extended indefinitely, until it embraces a 

 series of hatching troughs. Make the supply trough six inches 



