GILL FEVER. 147 



TREATMENT OF YOUNG FISH. 



All the young fish having hatched out, 

 my advice is certainly to leave them in the 

 boxes till the umbilical vesicle is absorbed. 

 They do not want any food, as I have before 

 explained, for they are supported by the 

 contents of the umbilical vesicle, and at 

 this time above all others require protection. 

 You may at this time increase your flow 

 of water, as I have discovered, from painful 

 experience, that water which is sufficient 

 for a given number of eggs is not sufficient 

 for the same number of young fish when they 

 come out of the eggs. It is at this time 

 that you will probably lose many young fish 

 from what is called " gill fever." A nasty 

 tenacious white fungus attaches itself to the 



L 2 



