Canon EOS 30D with EF 400mm f5.6L at ISO 200 f5.6 and 1/2500s. Image created at Sanibel islands Florida.
As an after thought, I could have possibly used a slower shutter speed and reduced aperture.
Very cool iamge, great catch, pun intended. I assume you were handholding, I would have hit the sand, a lower viewpoint would have been super good. Maybe after a few safety shots moving about 10 steps to the right would have helped even more.