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I was parked at a marina taking photos of a group of feeding (female) red-breased merganzers. As I was about to snap the photo above the sitting ducks started to take off for flight. My shutter speed was only set to 1/100 and I did not expect anything but a blur of the almost flying ducks. When I got to my computer that night I saw this shot and was not sure what I actually captured? There is a dock in the backround, there is a vertical piling on the right and a cooler sitting on the dock to the right. What is the thing near the center that looks like spokes on a wagon wheel? Is this the lens internals (blades) of my 400 f5.6 lens?

Sorry for all the newbie questions, just trying to learn. I will post some of the better photos in a few minutes of what I can actually identify from that day.