Ornamental Fish Q&A 05

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.		Link to Article
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.		Link to Article