not enough info on this one, for a start the camera settings will play the major factor in investigating this picture, and how far apart the photos were taken there could be a days delay between them for all we know.
The fact that the waters surfaces has little or no disturbance brings the authenticity of the image into question (beit deliberat or accidental) Otherwise the answer would need to fall in the catagory of a non solid "object" along the lines of petes ball lightning which would seem to account for the flash (ever chucked a bucket of water over a tv - dont try that at home), also the "trail could be steam as it burns off the natural water in the air. Also ball lightning is rarely seen in or out of labs so saying wheather it is or isnt ball lightning will be almost impossible and few could recognise it.
