yeah, i don't know enough about dorsals to have said that with any certaintity...i was just guessing...
either way, i'm jealous. i'd love to get that shot. i came within 10 feet of a nurse & reef shark this past week while diving & they were absolutely beautiful. got a shot of the nurse sleeping/sitting on the deck of the uss duane. only got a glimpse of the reef shark @ horseshoe reef.