184 DOMESTICATED TROUT. 



other trout for weeks. The reason was, that they were 

 sickly and feeble embryos, which had not vitality 

 enough in them to grow up. 



In order to have strong and healthy trout that will 

 live, you must have strong and healthy embryos to 

 begin with. This is so obvious, that it seems trivial to 

 mention it. Yet I have seen persons treat eggs in 

 such a way that the fish from them could not possibly 

 live to grow up, and wonder three months afterwards 

 what made them die. To insure strong and hardy 

 embryos, the suggestions in the chapter on hatching 

 eggs should be carefully observed. The eggs should 

 not be crowded too much. They should have plenty 

 of water, though not too much, running over them. 

 This water should be in constant circulation. The 

 two kinds of fungus, alga and byssus, should be abso- 

 lutely excluded. All sediment should be kept from 

 the eggs, and, in the writer's opinion, they should be 

 hatched in the dark. If you observe these rules, you 

 will have strong and healthy trout from your eggs, and 

 of these rules I should say that the most important 

 are, to avoid fungus and still water. 



3. Provide a suitable place for the young fry when 

 they begin to feed. We remarked that the hatching 

 troughs would do very well for the young trout for 

 the first few weeks after feeding. This is true, if the 

 fish are thinned out sufficiently, and a clean layer of 

 gravel or sand put over the winter hatching bed ; but 

 the hatching troughs are not favorable to growth, and 

 usually are not so convenient for feeding as other 

 places in which the fish might be kept. It is therefore 



