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Sunlight in the fall and winter is critical to maintain high quality colors hence all the greenhouses in Niigata.
The only time i have seen anything negative is in shallow ponds under bright sun where the koi actually get a burn if they don't have a place to hide and get into the shade. In your climate it would be a good idea to shade half your pond and allow them a chance to seek their own comfort
even in some grow ponds I have seen certain plants used to create floating areas of shade.
as a former avid fisherman I have seen many species with just their head under the shade of a sunken log or hiding under the end of a dock in the shade!
Bout the time I think we've answered all your questions then you surprise me! Keep up the good work!
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