Rearing. 77 



and endeavour to hide themselves, making free 

 use of the artificial shelters provided for them. 



Having treated of the food suited for the fry 

 for the first six weeks after feeding, and of their 

 removal before or at that time to the place 

 where the next year's, or two years', growth will 

 take place, we may return to the subject of 

 feeding. 



After supplying the fry with blood-worms or 

 gnats for six or eight weeks, according to their 

 strength, a change of food should be made ; but 

 it must not take place until they fly well at the 

 food and eat it up before it reaches the bottom. 

 They may leave the gnats uneaten without 

 harm, as these insects float on the surface and 

 do no damage beyond choking up a few of the 

 holes in the screens. Unconsumed blood-worms, 

 too, are perfectly innocuous, as they live in 

 water, and will tend to purify the water by re- 

 moving organic matter ; but the foods to be 

 hereafter mentioned, if left uneaten, will sink to 



