Trout Breeding. 47 



not left as a coat of paint. After four coats the grain 

 of the wood should show. A trough should be thus 

 coated every summer during its life_, but beware of put- 

 ting it on thick, like paint. After a few coats there will 

 be a gloss, but the object is to have the varnish strike 

 into the wood. Coat all your woodwork and wire 

 screens, dams, etc., in the hatchery, wherever water 

 touches, with the thinned coal tar. - Many fishculturists 

 use an asphalt varnish. It is as good as coal tar, but 

 while I have seen troughs coated with it, I never saw it 

 applied. A barrel of coal tar, or gas tar--^it's the sarne^^ 

 would cost less than $2, freight and all, and last for five 

 years. It is so good that I never experimented in any 

 other direction. The top of the trough should be three 

 feet four inches to three feet seven inches from the 

 floor, according to the height of the workers, sa that 

 they may not stoop at their work. 



TROUGH FOR YOUNG SALMONID^. 



In Forest and Stream of Feb.. 19, 1891, Mr. William 

 P. Seal makes a good suggestion. He says : "The 

 idea which has suggested itself to the writer as a result 

 of observation, though not of practical experience, is a 

 double trough, or trough inside a trough, as shown in 

 the accompanying sketch. One bottom answers for 

 both, of course. Along the sides of the inside trough 

 are arranged a series of angular chambers, made by 

 placing pieces of wood or metal of a required size at 

 an angle from the sides, and covering the mouth or 

 base of the angle with wire gauze, letting the wood 

 project some little distance beyond the gauze, as shdwn 

 in the sketch. 



