Terrifying scene out on the open waters near Florida on Sunday ... a shark bit off a fisherman's finger -- and, WARNING, video of the incident is graphic.
The attack went down in the Content Keys -- just a few miles south of Miami -- when Brett Reeder was attempting to corral a 6-foot lemon shark that he had just hooked.
As Reeder went down to grab the beast and get his tool out of the fish's gills -- it suddenly turned and chomped down on his hand.
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