When I first got my 12 goldfish I never fed them for years. They ate all the vegetation, bugs, worms etc. that fell into the pond. They did fine. Now I feed them, about 100 of them now, cuz I enjoy them coming to me. I don't think you could do this w/koi tho as they need more food for their bellies. I stop feeding them now when the temps get below 50F and then start up again in the Spring when over 50F.
If I lose a fish it's usually in the beginning of Spring.
I've never lost a fish during the winter months but my ponds never get below 55 degrees F.
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