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- 3 years
Koi (and goldfish for that matter) are NOT cold water fish. They are temperate water fish. They need the fluctuation of warmer water during the day and cooler water during the night as well as the seasonal water temperature changes. Most tropical fish can't handle the variety of temperature changes that are ideal for Koi and Goldfish. I keep tropicals (plecos, cories, cae) in my pond with my goldfish during the summer months when the water is warm enough for them, but they come in during the winter. My goldfish stay out year round and do great because they are receiving the temperature fluctuations they need. I have actually had danios, tetras, and several different of the smaller "shark" species in my pond over the years, but only in the summer when the water temp is warm enough for them. They then went to friends/family who had proper tanks for them. Koi need lots of room to swim. They also need larger volumes of water to help dilute their waste or you would end up having to do daily water changes to keep up with the ammonia etc. That is why ponds are best for Koi.ViridiosExotics said:Koi were first bred in China were it is hot. If you go to China, Hong Kong, Japan etc... you will see Koi in 'tropical' ponds with gouramis and other large tropicals.
If Koi were true coldwater fish then why do you have to bring them in for the winter and not goldfish, tench, rudd etc...???