Spent some time in Big Pine Key back in June - took the kids snorkeling at Looe Key a few times. After an hour on the reef we climbed back in the boat. My daughter and my friend's son stayed in the water next to the boat - her head pops out of the water "Dad there's a really BIG fish!" I climb in and see this guy right under the boat.
(shot with GoPro, standard housing and lens - sorry this isn't exactly a spear fishing vid, but I suppose you can imagine shooting this guy and hauling him into the boat)