Actually Koi aren't tank fish period. We have a young couple who specialize in landscaping and ponds out here and Koi have always to my knowledge been pond fish. Lots of people here have ponds in their yards and they even build up small falls, in them. It does wonders to beautify a property. Koi are the main kind of fish that are seen along with goldfish. Since we have pretty severe winters there are covers to put over the pond during the winter. Koi will become dormant around-10F and don't eat during the winter. In summer the ponds have nets to protect them from geese or other prey birds who in one swoop would swallow a Koi near the top of the pond. Raccoons are also notorious for raiding ponds for Koi, hence the netting to keep them at bay.
Keeping Koi in a tank is cruel in my opinion.





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