270 BRITISH FRESH-WATER FISHES 



Artificial propagation, of the results whereof upon the stock 

 of salmon in any river one has to speak with the reserve proper 

 to imperfect experience, has been applied to trout with perfect 

 success and certainty. A large number of commercial hatcheries 

 have been established in various part of the United Kingdom, 

 and there is now no difficulty in obtaining eyed ova, fry, year- 

 lings, or mature trout for the purpose of stocking or replenishing 

 lakes and streams. 



