42 DISEASES. 



don't know what is the matter with them, and how to cure 

 them. Before the food sac is gone the Trout is often 

 afflicted with a swelling over the sac ; a membrane forms 

 there, swells out large and is filled with a watery sub- 

 •stance. We call the disease the " dropsy," for want of a 

 better name. Sometimes the Trout may be saved by mak- 

 ing an incision in the swelling and letting out the water ; 

 but as with care only a few of them are affected in this 

 way, it is better for the fish culturist to hatch more eggs 

 than he expects to raise than to bother with a surgery he 

 does not understand. In other words, hatch more than 

 you want, and keep the strongest and best. 



In review of this chapter the main facts are that the in- 

 fant Trout are hard to raise. It is almost as if a great 

 rough man should attempt to raise a thousand infants' 

 deprived of their pare;its at birth. Most of the infant 

 Trout die of absolute starvation. They do not get food 

 enough. That which is given to them is not cut fine 

 enough, or for some cause they will not take it. 



