Ornamental Fish Q&A 05
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This question was provided by Manson Publishing as part of the OVAL Project. See more Ornamental Fish Q&A. |
| Question | Answer | Article | |
| What is the cause of these lesions, which resemble molten candlewax, on the dorsal fin of this koi? | Carp pox, caused by infection with Herpesvirus cyprini, also called cyprinid herpesvirus 1 (CHV1). These lesions are often classified as neoplasia but are basically an epidermal hyperplasia. |
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| How can this disease be controlled? | The disease is often seasonal and usually affects only a few fish in the pond. Lesions develop in low water temperatures (winter/spring) and regress when water temperatures increase. Treatment is seldom required because the disease is rarely fatal and is usually self-limiting. Lesions may recur the following year. |
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