278 



DOMESTICATED TROUT. 



to live on the digested matter into which they trans- 

 form it. 



Parasites which attack Large Trout, a Tentacles for fastening to the fish ; 

 b Mouth. 



This discovery led to some experiments in search of a 

 remedy, and it was found that a strong solution of salt de- 

 stroyed the parasites. Experiments were then made of 

 immersing trout in salt water, and it was found to be per- 

 fectly harmless, if not too long continued. A method was 

 thus found of killing the parasites without killing the fish, 

 which fact was confirmed by actually taking a trout cov- 

 ered with fungus and immersing him in a salt bath for 

 a moment or two, and afterwards keeping him by himself 

 for several days. The fungus peeled off, the parasites 



