Aquarium Fish
Ornamental fish kept in aquariums are susceptible to numerous diseases.
In most aquarium tanks, the fish are at high concentrations and the volume of water is limited. This means that communicable diseases can spread rapidly to most or all fish in a tank. An improper nitrogen cycle, inappropriate aquarium plants and potentially harmful freshwater invertebrates can directly harm or add to the stresses on ornamental fish in a tank. Despite this, many diseases in captive fish can be avoided or prevented through proper water conditions and a well-adjusted ecosystem within the tank. Ammonia poisoning is a common disease in new aquariums, especially when immediately stocked to full capacity.
Due to their generally small size and the low cost of replacing diseased or dead aquarium fish, the cost of testing and treating diseases is often seen as more trouble than the value of the fish.
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Goldfish with dropsy
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Columnaris in the gill of a chinook salmon
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The parasite Henneguya zschokkei in salmon beard
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Skin ulcers in tilapia exposed to Pfiesteria shumwayae
Read more about this topic: Fish Diseases
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