VERMONT AGRICULTURAL REPORT. 101 



made of clear pine stock for a permanent hatchery. L,ength of 

 hatching troughs 12 to 16 feet. Sides to be made out ot \ Y / Z inch 

 stock planed on both sides. The bottom and ends can be made 

 of i)4 inch stock but I prefer 2 inch stock. Depth of troughs 

 inside, 5 to 8 inches. If the fish are to be planted before they 

 must be fed artificially, a depth of five inches is sufficient. The 

 width of the troughs inside should be the same for all, and for 

 economy in cutting tray cloth, make it exactly 13 inches. 



Make the hole for waste pipe, g, figure 1, large enough to in- 

 sert ai^ inch pipe. Put this 2 inches from the lower end of the 

 trough. Two inches from the outlet pipe or four inches from the 

 lower end of the trough, nail two cleats vertically on each side, in 

 which to slide the slash board or dam, h, figures 1 and 2. Eight 

 inches from the lower end of the trough, put in two more pairs of 

 cleats in which to slide the tail screen, a. Allow 1 1-8 inches 

 space between the cleats. Make the cleats out of 5/g inches square 

 stock. The slash board, h, is 12^ inches long, 3 inches wide 

 and 1 inch thick. Two additional cleats are required at the head 

 of the trough, far enough below the edge to support the aerating 

 screen, b, so that it will be flush with the top of the trough. 

 If the troughs are arranged to set tandem as shown in figure 2, 

 they are built and equipped exactly as described above except 

 that in the head trough a plug is required for the waste pipe 

 h, and an outlet hole through the end of the trough is necessary. 

 If a trough 5 in. in depth, cut out a square in the end of the 

 trough, 4 inches wideand 3 inches deep. Make a tin lip to convey 

 the water from the first trough to the second one. A sheet of tin 

 from a tomato can will do for this purpose. Use lead paint un- 

 der the tin before tacking it on. If the trough is more than 6 in- 

 ches deep inside, I advise cutting out a hole in the end instead of 

 notching down from the top. 



Make two screens like figure 8, 12^ inches by the depth of 

 the trough inside. If the trough is 8 inches deep inside, make the 

 frames of the screens 8 inches x 12^ inches outside measure. 

 For the upright pieces of frames, use 1 inch square stock and for 



the top and bottom pieces, use 5-8 inch x 1 

 inch stock, nailing the thin sides of the top and 

 bottom pieces to the end pieces as shown in 

 figure 8. Cover the frames with No. 9 zinc, 

 perforated with holes, 324 to the square inch, 

 .033 diameter. A frame 12^ by 8 inches, 

 requires a piece of perforated zinc 7^ inches 

 32" " 1" "" 3" "n l a£h by 1 1 ^ inches. 



While the perforated metal is more expensive than wire cloth 

 it is far more durable and is more easily cleaned. If on account 

 of expense, wire cloth is to be used for these two screens, get ma- 

 terial described as "24 by 24, number 24 galvanized wire cloth." 



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