86 FISH DISEASES 



An entirely different kind of fin congestion is sometimes prevalent 

 in the fall, especially when the fishes are first taken in, the young being 

 more liable to attack. The base of the tail and other fins becomes 

 suddenly blood-red, the color sometimes extending to the body immedi- 

 ately adjoining. If allowed to continue, this form of the disease is 

 rapidly disastrous. Fortunately, it yields with surprising quickness to 

 either salt water or permanganate of potash treatment. When alter- 

 natives to salt-water treatment are suggested, the fancier will certainly 

 be on the safe side by giving the salt the first trial, particularly if care- 

 fully followed out as we have directed. 



White Fungus. This is next to the most common disease among 

 goldfishes and is responsible for the majority of deaths, except among 



Fig. 69. Fish Affected With White Fungus 



This illustration is characteristic of sick fishes in general. The fins are collapsed and 

 the general appearance is one of listlessness. 



very young fry. It begins on the tail and other fins, extending over 

 the body and into the gills. When it reaches this stage it is usually fatal. 

 The progress of the disease is marked by the development of a white 

 scum which destroys the fins, prevents the natural functions of the skin, 

 and when the parasite enters the gills causes death by suffocation. The 

 latter stage is not always reached, the fish often becoming so emaciated 

 as to die in the second stage of the malady. The fungus causing this 

 disease is present in virtually all water, but can usually make no inroads 

 on a fish in good condition. A weakened fish once infected will breed 

 so many bacteria that they can successfully attack the remaining well 

 fish. White fungus, therefore, is contagious, and the sufferer should be 

 removed from the others at once. This disease is caused by overcrowding, 

 overfeeding, lack of proper plant life, sudden temperature changes and 

 by bruises in shipment. 



