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In small aquariums, illnesses in common goldfish can quickly become fatal and require prompt treatment. Symptoms that indicate sick fish include cuts on any of the fins, a change in scale or eye coloration, excretions from the nostrils, scales falling off or the fish frequently rising towards the water surface.
A goldfish with dropsy Dropsy is a condition in fish caused by the buildup of fluid inside the body cavity or tissues. As a symptom rather than a disease in its own right, it can indicate a number of underlying diseases, including bacterial infections , parasitic infections, or liver dysfunction.
The popularity of such raw fish dishes makes it important for consumers to be aware of this risk. Raw fish should be frozen to an internal temperature of −20 °C (−4 °F) for at least seven days to kill parasites. It is important to be aware that home freezers may not be cold enough to kill parasites. [67] [68]
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Otherwise, some aquarists recommend surgery to remove the affected area if it is very serious, followed by an antibiotic bath treatment to prevent a secondary bacterial infection of the open wounds. Eventually the growths inhibit the fish's ability to swim, breathe or eat, and secondary bacterial infections usually kill the fish.
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Adult Siamese fighting fish (Betta splendens) with velvet disease. Initially, infected fish are known to "flash", or sporadically dart from one end of an aquarium to another, scratching against objects in order to relieve their discomfort. They will also "clamp" their fins very close to their body, and exhibit lethargy. If untreated, a 'dusting ...