I posted this in Freeze-a-palooza as well - I was thinking whitefish - but the anal fin looks a bit pronounced. Wish I'd gotten a still of it but my 6.5mm gloves make fast changes impossible. If anybody has seen more cisco and whitefish maybe you can make a more positive ID.
http://photos.imageevent.com/blueroom/lakemichiganfreediving/CIMG1028.AVI
http://photos.imageevent.com/blueroom/lakemichiganfreediving/CIMG1028.AVI
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