148 FISH HATCHING. 



gills, and in a short time completely obstructs 

 the action. This seems to me to be a regular 

 epidemic among fish, and may be said to be 

 analogous to measles and scarlatina among 

 the young of our own species. You will also 

 observe a fungus growing on the backs of the 

 weakly fish. I know no remedy for these 

 diseases, except separating the fish, that they 

 shall not be overcrowded, causing the stream 

 of water to be increased, and attending to the 

 hides and general cleanliness. By looking to 

 ihese points you will save many fish, both in 

 your outdoor and indoor boxes. 



The time will soon arrive when the fish 

 will require feeding. When the umbilical 

 bag is empty they will begin to feed by the 

 mouth, and at this time if you do not feed 

 them, they will peck at each other's tails, 



