Depends on the depth of a water also,a shallow water of say 3ft deep if all that freezes then yes,but that is very extreme and never going to happen.
rainbows are as someone said cold blooded and will not suffer ,not all are just holes in the ground,there has to be water to feed into them somewhere,be it underground springs,bore holes,burns,rivers and so on which will generate oxygen.
Oxygen can be put in also with the use of pumps.
Some will die,mainly due to nature and also as their immune system at this time of year is low in the females ,not the triploid. and any damaged fish will die off,which can only be good leaving only hardend fish remaining.
Good for anglers when it clears.
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Kevin
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