Will my Koi survive during winter in an outdoor pond?
	Koi can survive under the ice in extreme cold as long as the water does not freeze solid. Koi will not move around or eat much if the pond water is very cold. Some individual fish just inexplicably die, but overall, Koi are remarkably hardy and healthy fish; much more so than goldfish or tropical fish. Just be sure to have an opening in the ice covering your pond so that no harmful gases build up.