Trout Breeding. 83 



over the eggs each day, remove all dirt, dead eggs or 

 other matter ; keep everything clean, see that the flow 

 of water is regular and wait for the hatching to begin. 



HATCHING IN BULK. 



Some years ago I devised a series of trays to hatch in 

 layers, which improved on the Clark- Williamson 

 trough, which had fixed partitions in it where the water 

 went under one and over the next. (See cut.) Fig. i 

 is copied from plate XVI, Report U. S. F. C., 1872-73, 



and shows a "nest of trays in Williamson's Double 

 Riffle Hatching Box." It will be noticed that the 

 dams are permanent and in pairs, the upper one being 

 the lowest to permit the water to flow over it and up 



