20 MARVELS OF FISH LIFE 



white patches are patches of Saprolegnia ferax. Fungus 

 attacks fish when they are weak and unhealthy, and 

 the cause of the trouble is usually to be found in 

 want of cleanliness, in insufficiently oxygenated water, 

 and in want of shade for the fish. To treat fish when 

 attacked, if the trouble has not gone too far, is not 

 difficult. Dissolve two or three handfuls of common 

 salt in a bucket of water, and let the diseased fish swim 

 about in this until they turn on their backs. Revive 

 them in fresh water, and repeat the process two or three 

 times, and for the future keep them in healthy surround- 

 ings. 



Big patches of fungus may be treated by swabbing 

 with a strong solution of Condy's fluid, and a lump of 

 rock salt occasionally placed in the tank or aquarium 

 is a deterrent to fungus. Above all, the woodwork must 

 be charred or painted, otherwise fungus is sure to appear. 



