Overwintering goldfish in Manitoba

[intarsiabox]

My pond at my previous house was used to over winter my goldfish and koi. I just made half of the pond 3+ feet deep and this is usually enough to prevent freezing to the bottom in prairie winters. None of my fish were big monster so I never used any pumps or airlines but it doesn't cost much to run an airline all winter to keep the water oxygenated.