Two years ago a small beaver pond just North of me turned absolutely blood red right before freeze up and froze with red ice, It puzzled me what the heck would cause that and at the time the only explanation I could come up with was someone had either shot a bunch of beaver or a deer or something but it was so red that I thought it was impossible . Anyway, fast foreword to last fall and I saw the exact same thing on a different pond right after freeze up. I have no idea what could case this but since I saw it twice I'm sure someone else has saw this too. What the heck could cause this ?