Good morning, Silly question here that I don't know if anyone might know the answer to. I have about 4 inches or more of ice on my pond and some snow over top of it in areas and slush in others ( from yesterdays storm ) When I went out to clear off some of the snow, I noticed some areas that had small ( about 1 to 2 inch ) round openings in the ice. As I scraped over them the water from the pond came up through it.

I am starting to see some of the winter algae starting to form under the ice and as such was wondering if this is an exothermic reaction or maybe something to do with the growth of the algea and heat being thrown off. Any ideas would be welcome.


---------------------------------
1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY