162 FISH HATCHING. 



escape into the stream when they please. It 

 is also advisable to keep some of them in a 

 ditch, containing from one to three feet deep 

 of flowing (not rapid) water, for the sake of 

 comparing them with the fish that have been 

 turned out into the open. A water-cress 

 bed is a capital place. Recollect always they 

 are not to be turned down till the umbilical 

 bag is absorbed, and they require food. 



As regards the turning out question, when 

 it refers to salmon, and salmon only, I have 

 no positive experience myself, and must there- 

 fore beg to refer my readers to an admirable 

 little book on salmon breeding by Wr. William 

 Brown, of Perth ; also the Messrs. Ash- 

 worth's treatise,* which is full of the re- 



* A Treatise on the Propagation of Salmon and other Fish. 

 By Edward and Thomas Ashworth. London. Simpkin and 

 Marshall. 1853. Price (I think) 1*. 



