Costiasis


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Costiasis

 

a serious disease of young freshwater fish, resulting in mass deaths. It occurs everywhere and is caused by a flagellated protozoan ( Costia necatrix). Infected fry are identified by the formation of dull, bluish gray spots that in severe infestations coalesce into a solid coating. Often the fins decompose and the fin rays become exposed. Salt, formaldehyde, and other baths are used to treat the disease. Measures for the prevention of costiasis include feeding the fry good-quality live food, improving hygienic conditions in ponds, and exterminating the parasites in the environment.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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