You should avoid swimming if you are bleeding. I will tell you this, the salt water of the Gulf is great for healing wounds. Just be aware of your surrounding if you go out in it.
I would have given anything to be on paddling on my kayak and have all of those small sharks swimming around below me the other day. I cannot imagine the intense feelings that would give me. I remember my first encounter with a school of Dolphins a few years ago. I was a bit nervous as they were popping up on all sides of me. After I relaxed a bit, it was one of the moments in my life when I had a deep sense of grounding to the Earth. I image that if I had been paddling with those sharks, when it was all over, I would be much less concerned about paddling out past the second sandbar. I still hate that I saw JAWS at such an early age. That movie was just wrong, wrong, wrong!