HATCHING APPARATUS. 57 



They seem to have solved the problem of obtaining 

 a safe, economical, and durable material for hatching 

 trout. I am aware that some of our largest operators 

 have used wood loosely lined with glass, but it costs a 

 good deal to get the glass, and it is also extremely un- 

 safe when the young fry hatch, for they will get under 

 the glass by thousands, and die of suffocation ; and 

 finally it does not answer perfectly, as charcoal does, 

 the purpose for which it is used, namely, to obviate 

 the growth of fungus. 



I would recommend, therefore, the use of glass grilles 

 if you have the means and think they are better. Use 

 charcoal or charred wood if you do not use grilles. 



Placing the Hatching Troughs. 



Having decided on the material for the hatching 

 boxes, the next thing is to construct and place them. 

 If you use charcoal or carbonized troughs, you should 

 first send to the Cold Spring Trout Ponds, at Charles- 

 town, N. H., and obtain the right to use them, they 

 being patented, and the directions how to prepare 

 them. 



As to the size and shape of the hatching boxes or 

 troughs, a great variety of opinion prevails. The fol- 

 lowing suggestions, however, may serve as a guide in 

 making a selection. If you are limited in your supply 

 of water, you should use long and rather narrow troughs, 

 say twenty feet long by eight inches wide, and if you 

 wish, you can have another trough of the same size be- 

 low the first tier, using the same water over again, pro- 

 vided you have a fall between the two troughs of six 



