CHAPTER VL 



Adult Trout. 



Supply of "Water for Given Nu:mber of Trout. — 

 This has never yet been accurately determined, and we do 

 not know that any general rule can be given applicable to 

 all times and places : because the supply of water required 

 for any given number depends very much upon the tem- 

 perature of the water, — a given supply in cold weather 

 sustaining many more in good condition than the same 

 supply in hot weather. It is the same with Trout as with 

 mankind. If many people are packed together in a close 

 room, they will soon begin to suffer ; but will not feel the 

 bad effects so soon in cold weather as in warm. Now the 

 water contains the air upon which the Trout lives, and the 

 supply for any given number depends also upon the 

 amount of air which is in the water. A still and smooth 

 flowing stream, witli little vegetation in it, contains the 

 least amount of air. Hence the value of a fall of water 

 between the ponds if the supply is small. The volume 

 of water required depends also upon the shape of the 

 ponds and upon the size of the fish. We can only say 

 al)Out what quantity is necessary and leave each owner of 

 ponds to observe for himself whether more or less fish do 

 well in his locality, and under the circumstances, of ponds, 

 supply, &c., which he has made. It must always be borne 

 in mind that the larger the supply of water the better for 

 the Trout ; and the Trout-breeder on a large scale will find 

 better success with small ponds and large supply than in 

 any other way. For ten thousand fish the water supply 



