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AIR BUBBLE DISEASE

Definition

Gas embolism in various organs and cavities of the fish, caused by super-saturation of, in the main, the inert gases of the atmosphere. Gas-bubble disease often affects fish in discharge canals below power plants in winter when cold water is rapidly heated by passage through the power plant condensers. It is also a problem in hatcheries, particularly those using bore-hole water. Fish exposed to supersaturated water may exhibit exophthalmia and other symptoms similar to the" bends" experienced by divers making too swift an ascent.

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