50 Modern Pishculture in Fresh and Salt Water. 



if it was in glass. Asphalt varnish is equally good, as 

 I have seen, but coal tar was always so handy and so 

 perfectly satisfactory that I never used anything else. 



Coat all troughs, trays and everything which comes in 

 contact with the water every summer and they will last 

 long and be sweet and clean. 



HATCHING TRAYS. 



These should be made ^ inch narrower than the 

 troughs. Make them of fx| inch stuff, to lie flat — i. e., 

 the half-inch to be the depth. Heavier wood will float 

 the trays. Halve the corners so that they can be nailed 

 both ways, and make the length as you wish. A 14-foot 

 trough wants about six inches for the water to spend 

 its downward force in, and as much for the lower dam. 

 Seven screens of 22 inches each, outside measure, will 

 be plenty for a trough of that length. 



Have your wire-cloth for the trays especially woven. 

 As the trays will be 13 J inches wide and the selvege 

 will be irregular, have the wire-cloth 13 inches and as 

 long as may be needed. For trout let it be in this way : 

 Meshes f inch long by J wide, the length of the mesh 

 to run across the trough. The warp, which runs the 

 long way, being of fine wire. No. 24, and double, going 

 over and under the heavier woof, or filling, of Xo. 18 

 wire. This gives us the long mesh across the trough 

 and the &ggs do not wash and bunch in the current. 

 The embryo fish will then drop through the meshes. 

 Put the wire-cloth on the frames with sniall double- 

 pointed tacks, and put one in each corner of the frame 

 for a leg, in order that the water may flow under the 

 tray, as well as over it. 



