Questions tagged [koi]

Koi are domestic carp, that have been bred to be optically pleasing. They are related to goldfish but grow bigger.

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Koi fish sick and lethargic

I have a very large (8 feet by 12 feet by 6 feet deep) koi fish pond with a waterfall and extensive filtration system I inherited with the house. In it is a very large and older koi (18 inches long ...
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My koi fishes are dying every day

It all started last week. My big koi started to spin out of control and died the same day. I went to the pond place and they gave me a parasite treatment bottle, with instructions to use it for 3 days....
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Had Koi for five winters this year they have all slowly died in a span of a week

My wife was at our local Country Garden where the women said we should remove the filter for the winter. I have left the filter running the last five winters and have never had a problem. But this ...
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Do I have to take my Koi Fish out of my 30 Gallon Tank eventually?

I accidentally bought a Koi fish thinking it was just a normal goldfish. After about 4 years now, he has gotten bigger (mouth to tail ~ 7 inches long) and more aggressive in our 30 gallon aquarium. He ...