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- Feb 26, 2018
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I've had a koi pond for a couple of years now. The other day I noticed two of the fish were scraping on the bottom of the pond, a sign I've always taken as an indication of a parasite infestation. However, the water temp is just above freezing, and I have an 11watt UV lamp in my filter. The water is clear and is a quarter decanted every month. I have just bought some anti-parasite treatment (not used yet) but my local aquarist tells me that the treatment is ineffective at low temperatures and that parasites are unlikely in such cold water. Does anyone have any experience with pond parasites? Any advice would be gratefully received, thank you. (I have included a picture of the tail of one of my koi with what appear to be white spots.)