nah, but i just about ran over one. i was just getting to elephant rock(its a zoo out there) when saw this thing in the water. as i got closer i realised it was a shark.

i aimed just to the side of it thinking i would scare it off with the bullet, but it didn't move so i had to lift my paddle off over the top, then it moved off and away slowly.
looked like it was sunning itself or something. about 3 to 4 ft long. first time i've seen one on the surface

beautiful colours. no photos, but it did happen