. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. FISH DISEASES 153 water will be all that is necessary if taken in time. Two grains of permanganate of potash to the gallon of water is a successfur treat- ment for goldfishes, but is dangerous to tropicals. It is best to use this in an enamel or a glass receptacle. Organic substances, such as wood or floating particles of dirt, quickly decompose the chemical. The fish may be given the permanganate treatment several hours at a time, but a fresh solution should be made daily.
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. FISH DISEASES 153 water will be all that is necessary if taken in time. Two grains of permanganate of potash to the gallon of water is a successfur treat- ment for goldfishes, but is dangerous to tropicals. It is best to use this in an enamel or a glass receptacle. Organic substances, such as wood or floating particles of dirt, quickly decompose the chemical. The fish may be given the permanganate treatment several hours at a time, but a fresh solution should be made daily. An entirely different kind of fin congestion is sometimes prevalent in the fall, especially when the fishes are first taken in, young fishes being more liable to attacks. The base of the tail and other fins be- comes suddenly blood-red, the color sometimes extending to the body immediately adjoining. If allowed to continue, this form of the dis- ease is rapidly disastrous. Fortunately, it yields with surprising quickness to either salt water or permanganate of potash treatment. When alternatives to salt-water treatment are suggested, the fancier will certainly be on the safe side by giving the salt the first trial, par- ticularl}' if carefully 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 very young fry. It begins on the tail and other fins, extending over. Fig. 149. Fish Affected With White Fungus This illustration is characteristic of sick fishes in general. The fins are col- lapsed and the general appearance is one of listlessness. 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 suf- focation. The latter stage is not always reached, t
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