Cecil, I have been monitoring D.O. amongst other things on a weekly basis this winter. Saturday (the 31st of January) the ice was 24 inches with a few inches of melted and then re-frozen snow on top. The ice is pretty much clear.
D.O. averages 10.5 ppm from 1 ft down to 13 feet. At 14 feet drops it drops to 7.6 ppm. The fish are quite active below the ice (video checking). My current assumption is that the relatively high D.O. keeps them active even though we are a long ways into this winter.
