40 Modern Fishculture in Fresh and Salt Water. 



the greater the lapse of time the more distinct is the 

 memory. 



CHAPTER II. 



IN THE HATCHING HOUSE. 



Trout can be hatched without a house, but not as well 

 as in one. Eggs may be procured and put in the gravel 

 of a spring or of a running stream in "redds," as nests 

 are called across the water but the dangers they meet 

 there have been told, and not one in fifty will become a 

 trout. They may be hatched in covered troughs which 

 have graveled bottoms, but frost may interfere with the 

 level or may stop the water supply ; inquisitive persons 

 may replace the covers carelessly and let in sunshine, or 

 other things may interfere with the success of the ven- 

 ture. By all means do your hatching under a roof if 

 you wish to succeed. 



A house 20x30 feet will contain 12 troughs, placed 

 by twos, with a single one at each end, and in single 

 layers of eggs will have a capacity of 300,000 eggs 

 which can be hatched and the fry fed in the troughs for 

 a month or more. The capacity can be increased four 

 or five times, but the fry must be removed before feed- 

 ing. The house should have a cupola or an airshaft at 

 the top to carry off the vapor, which would otherwise 

 condense on the walls and windows. Brick walls will 

 absorb moisture, freeze and crumble, and a lining of 

 yellow pine ceiling with the same material for the floor 

 is best because it swells less than other available woods, 



