When one does timed-exposures with moving water, at night, you are never quite sure what the result will be. There's only one way to find out: try it!
This is a ten second exposure photographed at the Salton Sea last month, about twenty minutes after sunset. The Great Blue Heron was nearly motionless, and appears sharp. It has a bit of light on it from the glow of lights from a nearby geothermal plant. The evening was windy and the water choppy, the long exposure smooths it somewhat.