The higher ISO and fast shutter speed was due to the shot being hand held at knee level. I had to run out between the waves and the sand was too soft for a tripod. Live View used for composition. This shot was taken in Jan. 2010. When I returned a few months later for a low tide, sunrise shot at the same location, I found a large expanse of rocks & tide pools. The seaweed in the above image is tethered to rocky tide pools which are covered with sand much of the year.
Mike K

That is a very nice picture!!