My hunt for white sharks off Chatham

[Fish_Eye]

Thanks to a full moon and a very low tide I was able to get very close to these grey seals...talk about out of control.

I didn't notice the fin (at least it looks like one to me) until after I started working with the images earlier today. I can't be 100% sure it's a white shark's fin, however, I blew the shot up and I can't imagine it being a seal or a passing bird.