April 15, 2013, Winch Hole, Molasses Reef (M-7), Key Largo, Florida. Depth 29 feet. Bottom temperature 78 degrees.
One reason the photo is so poor is the shark would not let me get close. (Non-divers will not understand that sentence.) Not aggressive, somewhat shy. Three-and-a-half-to-four feet. Pointed snout. To me, definitely not the regular nurse shark of Caribbean reef shark. Caudal fins asymetrical. First dorsal fin seemed more pointed than rounded to me.
I tried the interactive DVD, and I am leaning toward blacknose shark, but I really need help.